Long messages can break chat layout after window changes #458

Closed
Closed
Long messages can break chat layout after window changes#458
Labels
bugSomething is broken or behaving incorrectly.

Description

@GuilhermeVieiraDev
GuilhermeVieiraDev
opened on Mar 8, 2026

I found a rendering bug in the desktop app when a conversation contains a very long user message.

After certain window/layout changes, the chat can break in a few ways:

  • a huge empty vertical gap appears between messages
  • some messages visually overlap other messages
  • rows can appear out of place / visually out of order

I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.

Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.

Environment:

  • Arch Linux
  • Observed first in t3code-bin from AUR
  • Also reproduced after cloning the repo locally

How to reproduce:

  1. Open a chat/thread
  2. Send a very large message so it wraps heavily and becomes very tall
  3. Let the conversation continue so there are several rows after it
  4. Change the window layout somehow:
    • move it between monitors, or
    • take it out of fullscreen / drag it around, or
    • otherwise cause a noticeable window/layout change, like resizing the window
  5. Look at the layout of the rows that follow the very long message

What happens:

  • a very large empty vertical gap can appear between rows
  • some messages can overlap other messages
  • the visual order can become wrong because rows are drawn on top of each other

My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.

I’m attaching:

  • a video showing the bug happening
  • a screenshot showing rows overlapping
  • the large text I used to reproduce it
ImageImage
Screencast.From.2026-03-07.23-48-52_fixed.mp4
Large text used to reproduce

Testing a very long message, use some tool calls to explore the project

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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Long messages can break chat layout after window changes #458
      Closed
      Closed
      Long messages can break chat layout after window changes#458
      Labels
      bugSomething is broken or behaving incorrectly.
      Description
      @GuilhermeVieiraDev
      GuilhermeVieiraDev
      opened on Mar 8, 2026
      I found a rendering bug in the desktop app when a conversation contains a very long user message.
      After certain window/layout changes, the chat can break in a few ways:
      • a huge empty vertical gap appears between messages
      • some messages visually overlap other messages
      • rows can appear out of place / visually out of order
      I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
      Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
      Environment:
      • Arch Linux
      • Observed first in t3code-bin from AUR
      • Also reproduced after cloning the repo locally
      How to reproduce:
      1. Open a chat/thread
      2. Send a very large message so it wraps heavily and becomes very tall
      3. Let the conversation continue so there are several rows after it
      4. Change the window layout somehow:

        • move it between monitors, or
        • take it out of fullscreen / drag it around, or
        • otherwise cause a noticeable window/layout change, like resizing the window
      5. Look at the layout of the rows that follow the very long message
      What happens:
      • a very large empty vertical gap can appear between rows
      • some messages can overlap other messages
      • the visual order can become wrong because rows are drawn on top of each other
      My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
      I’m attaching:
      • a video showing the bug happening
      • a screenshot showing rows overlapping
      • the large text I used to reproduce it
      ImageImage
      Screencast.From.2026-03-07.23-48-52_fixed.mp4
      Large text used to reproduce
      Testing a very long message, use some tool calls to explore the project
      ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
      
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Long messages can break chat layout after window changes #458
          Closed
          Closed
          Long messages can break chat layout after window changes#458
          Labels
          bugSomething is broken or behaving incorrectly.
          Description
          @GuilhermeVieiraDev
          GuilhermeVieiraDev
          opened on Mar 8, 2026
          I found a rendering bug in the desktop app when a conversation contains a very long user message.
          After certain window/layout changes, the chat can break in a few ways:
          • a huge empty vertical gap appears between messages
          • some messages visually overlap other messages
          • rows can appear out of place / visually out of order
          I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
          Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
          Environment:
          • Arch Linux
          • Observed first in t3code-bin from AUR
          • Also reproduced after cloning the repo locally
          How to reproduce:
          1. Open a chat/thread
          2. Send a very large message so it wraps heavily and becomes very tall
          3. Let the conversation continue so there are several rows after it
          4. Change the window layout somehow:

            • move it between monitors, or
            • take it out of fullscreen / drag it around, or
            • otherwise cause a noticeable window/layout change, like resizing the window
          5. Look at the layout of the rows that follow the very long message
          What happens:
          • a very large empty vertical gap can appear between rows
          • some messages can overlap other messages
          • the visual order can become wrong because rows are drawn on top of each other
          My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
          I’m attaching:
          • a video showing the bug happening
          • a screenshot showing rows overlapping
          • the large text I used to reproduce it
          ImageImage
          Screencast.From.2026-03-07.23-48-52_fixed.mp4
          Large text used to reproduce
          Testing a very long message, use some tool calls to explore the project
          ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
          
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
          Metadata
          Metadata
          Assignees
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            Labels
            bugSomething is broken or behaving incorrectly.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Long messages can break chat layout after window changes #458
              Closed
              Closed
              Long messages can break chat layout after window changes#458
              Labels
              bugSomething is broken or behaving incorrectly.
              Description
              @GuilhermeVieiraDev
              GuilhermeVieiraDev
              opened on Mar 8, 2026
              I found a rendering bug in the desktop app when a conversation contains a very long user message.
              After certain window/layout changes, the chat can break in a few ways:
              • a huge empty vertical gap appears between messages
              • some messages visually overlap other messages
              • rows can appear out of place / visually out of order
              I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
              Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
              Environment:
              • Arch Linux
              • Observed first in t3code-bin from AUR
              • Also reproduced after cloning the repo locally
              How to reproduce:
              1. Open a chat/thread
              2. Send a very large message so it wraps heavily and becomes very tall
              3. Let the conversation continue so there are several rows after it
              4. Change the window layout somehow:

                • move it between monitors, or
                • take it out of fullscreen / drag it around, or
                • otherwise cause a noticeable window/layout change, like resizing the window
              5. Look at the layout of the rows that follow the very long message
              What happens:
              • a very large empty vertical gap can appear between rows
              • some messages can overlap other messages
              • the visual order can become wrong because rows are drawn on top of each other
              My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
              I’m attaching:
              • a video showing the bug happening
              • a screenshot showing rows overlapping
              • the large text I used to reproduce it
              ImageImage
              Screencast.From.2026-03-07.23-48-52_fixed.mp4
              Large text used to reproduce
              Testing a very long message, use some tool calls to explore the project
              ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
              
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                bugSomething is broken or behaving incorrectly.
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Long messages can break chat layout after window changes #458
                  Closed
                  Closed
                  Long messages can break chat layout after window changes#458
                  Labels
                  bugSomething is broken or behaving incorrectly.
                  Description
                  @GuilhermeVieiraDev
                  GuilhermeVieiraDev
                  opened on Mar 8, 2026
                  I found a rendering bug in the desktop app when a conversation contains a very long user message.
                  After certain window/layout changes, the chat can break in a few ways:
                  • a huge empty vertical gap appears between messages
                  • some messages visually overlap other messages
                  • rows can appear out of place / visually out of order
                  I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
                  Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
                  Environment:
                  • Arch Linux
                  • Observed first in t3code-bin from AUR
                  • Also reproduced after cloning the repo locally
                  How to reproduce:
                  1. Open a chat/thread
                  2. Send a very large message so it wraps heavily and becomes very tall
                  3. Let the conversation continue so there are several rows after it
                  4. Change the window layout somehow:

                    • move it between monitors, or
                    • take it out of fullscreen / drag it around, or
                    • otherwise cause a noticeable window/layout change, like resizing the window
                  5. Look at the layout of the rows that follow the very long message
                  What happens:
                  • a very large empty vertical gap can appear between rows
                  • some messages can overlap other messages
                  • the visual order can become wrong because rows are drawn on top of each other
                  My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
                  I’m attaching:
                  • a video showing the bug happening
                  • a screenshot showing rows overlapping
                  • the large text I used to reproduce it
                  ImageImage
                  Screencast.From.2026-03-07.23-48-52_fixed.mp4
                  Large text used to reproduce
                  Testing a very long message, use some tool calls to explore the project
                  ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
                  
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    bugSomething is broken or behaving incorrectly.
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Long messages can break chat layout after window changes #458
                      Closed
                      Closed
                      Long messages can break chat layout after window changes#458
                      Labels
                      bugSomething is broken or behaving incorrectly.
                      Description
                      @GuilhermeVieiraDev
                      GuilhermeVieiraDev
                      opened on Mar 8, 2026
                      I found a rendering bug in the desktop app when a conversation contains a very long user message.
                      After certain window/layout changes, the chat can break in a few ways:
                      • a huge empty vertical gap appears between messages
                      • some messages visually overlap other messages
                      • rows can appear out of place / visually out of order
                      I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
                      Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
                      Environment:
                      • Arch Linux
                      • Observed first in t3code-bin from AUR
                      • Also reproduced after cloning the repo locally
                      How to reproduce:
                      1. Open a chat/thread
                      2. Send a very large message so it wraps heavily and becomes very tall
                      3. Let the conversation continue so there are several rows after it
                      4. Change the window layout somehow:

                        • move it between monitors, or
                        • take it out of fullscreen / drag it around, or
                        • otherwise cause a noticeable window/layout change, like resizing the window
                      5. Look at the layout of the rows that follow the very long message
                      What happens:
                      • a very large empty vertical gap can appear between rows
                      • some messages can overlap other messages
                      • the visual order can become wrong because rows are drawn on top of each other
                      My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
                      I’m attaching:
                      • a video showing the bug happening
                      • a screenshot showing rows overlapping
                      • the large text I used to reproduce it
                      ImageImage
                      Screencast.From.2026-03-07.23-48-52_fixed.mp4
                      Large text used to reproduce
                      Testing a very long message, use some tool calls to explore the project
                      ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
                      
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Long messages can break chat layout after window changes #458
                          Closed
                          Closed
                          Long messages can break chat layout after window changes#458
                          Labels
                          bugSomething is broken or behaving incorrectly.
                          Description
                          @GuilhermeVieiraDev
                          GuilhermeVieiraDev
                          opened on Mar 8, 2026
                          I found a rendering bug in the desktop app when a conversation contains a very long user message.
                          After certain window/layout changes, the chat can break in a few ways:
                          • a huge empty vertical gap appears between messages
                          • some messages visually overlap other messages
                          • rows can appear out of place / visually out of order
                          I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
                          Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
                          Environment:
                          • Arch Linux
                          • Observed first in t3code-bin from AUR
                          • Also reproduced after cloning the repo locally
                          How to reproduce:
                          1. Open a chat/thread
                          2. Send a very large message so it wraps heavily and becomes very tall
                          3. Let the conversation continue so there are several rows after it
                          4. Change the window layout somehow:

                            • move it between monitors, or
                            • take it out of fullscreen / drag it around, or
                            • otherwise cause a noticeable window/layout change, like resizing the window
                          5. Look at the layout of the rows that follow the very long message
                          What happens:
                          • a very large empty vertical gap can appear between rows
                          • some messages can overlap other messages
                          • the visual order can become wrong because rows are drawn on top of each other
                          My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
                          I’m attaching:
                          • a video showing the bug happening
                          • a screenshot showing rows overlapping
                          • the large text I used to reproduce it
                          ImageImage
                          Screencast.From.2026-03-07.23-48-52_fixed.mp4
                          Large text used to reproduce
                          Testing a very long message, use some tool calls to explore the project
                          ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
                          
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            bugSomething is broken or behaving incorrectly.
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              Long messages can break chat layout after window changes #458
                              Closed
                              Closed
                              Long messages can break chat layout after window changes#458
                              Labels
                              bugSomething is broken or behaving incorrectly.
                              Description
                              @GuilhermeVieiraDev
                              GuilhermeVieiraDev
                              opened on Mar 8, 2026
                              I found a rendering bug in the desktop app when a conversation contains a very long user message.
                              After certain window/layout changes, the chat can break in a few ways:
                              • a huge empty vertical gap appears between messages
                              • some messages visually overlap other messages
                              • rows can appear out of place / visually out of order
                              I first noticed it when moving the app from a very wide monitor to a smaller/normal monitor, but it is not limited to cross-monitor moves. I can also trigger it by changing the window state/layout on the same monitor, for example when the app is fullscreen and I grab the window and move it around.
                              Changing zoom after the bug appears makes the layout correct itself immediately, which makes this feel like a rendering/measurement issue rather than a content issue.
                              Environment:
                              • Arch Linux
                              • Observed first in t3code-bin from AUR
                              • Also reproduced after cloning the repo locally
                              How to reproduce:
                              1. Open a chat/thread
                              2. Send a very large message so it wraps heavily and becomes very tall
                              3. Let the conversation continue so there are several rows after it
                              4. Change the window layout somehow:

                                • move it between monitors, or
                                • take it out of fullscreen / drag it around, or
                                • otherwise cause a noticeable window/layout change, like resizing the window
                              5. Look at the layout of the rows that follow the very long message
                              What happens:
                              • a very large empty vertical gap can appear between rows
                              • some messages can overlap other messages
                              • the visual order can become wrong because rows are drawn on top of each other
                              My guess is that this is related to stale cached measurements in the virtualized chat/message timeline after a resize/reflow/layout change. I’m not confident enough in the project’s internal patterns to propose a PR, but this seems reproducible and likely frontend-only.
                              I’m attaching:
                              • a video showing the bug happening
                              • a screenshot showing rows overlapping
                              • the large text I used to reproduce it
                              ImageImage
                              Screencast.From.2026-03-07.23-48-52_fixed.mp4
                              Large text used to reproduce
                              Testing a very long message, use some tool calls to explore the project
                              ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
                              
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╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                bugSomething is broken or behaving incorrectly.
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                                No projects
                                  Milestone
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                                  Issue actions