fix(desktop): avoid Windows capture stalls - #12

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fix(desktop): avoid Windows capture stalls#12
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom
SunkenInTime:t3code/build-install-pr-8103

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@SunkenInTimeSunkenInTime commented Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.

Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.

Measured on Windows:

  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts

Verification:

  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified

The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.

Generated with Codex (GPT-5.6-sol).

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fix(desktop): avoid Windows capture stalls - #12
Open
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
Open
fix(desktop): avoid Windows capture stalls#12
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
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Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
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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");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(desktop): avoid Windows capture stalls - #12
Open
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Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
Open
fix(desktop): avoid Windows capture stalls#12
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Bil0000:feat/window-capturefrom 
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Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
@SunkenInTimeSunkenInTime
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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
fix(desktop): avoid Windows capture stalls - #12
Open
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
Open
fix(desktop): avoid Windows capture stalls#12
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
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@SunkenInTimeSunkenInTime
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Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
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, '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
fix(desktop): avoid Windows capture stalls - #12
Open
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
Open
fix(desktop): avoid Windows capture stalls#12
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
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Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
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, '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('^' + ".*" + '

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fix(desktop): avoid Windows capture stalls - #12
Open
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Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
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fix(desktop): avoid Windows capture stalls#12
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Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
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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
fix(desktop): avoid Windows capture stalls - #12
Open
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Bil0000:feat/window-capturefrom 
SunkenInTime:t3code/build-install-pr-8103
Open
fix(desktop): avoid Windows capture stalls#12
SunkenInTime wants to merge 1 commit into
Bil0000:feat/window-capturefrom 
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Aug 30, 2026

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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
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, '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); }
})();
})();

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fix(desktop): avoid Windows capture stalls - #12
Open
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SunkenInTime:t3code/build-install-pr-8103
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fix(desktop): avoid Windows capture stalls#12
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The Windows desktopCapturer path requests thumbnails for every visible source. On the affected machine, Chromium's Windows Graphics Capture backend repeatedly waited five seconds for an uncapturable source, delaying the handoff before the spring animation could begin.
Use xa11y's native region screenshot for direct Windows captures instead. The active window's DIP bounds and metadata remain authoritative, while macOS and Linux keep their existing capture paths.
Measured on Windows:
  • before: about 5.9s to visible feedback
  • cold after: 184.9ms
  • warm after: 168.3ms
  • no new WGC first-frame timeouts
Verification:
  • vp run --filter @t3tools/desktop typecheck
  • targeted vp lint
  • live cold/warm Paint captures with image, foreground handoff, spring motion, and attachment verified
The focused unit test is included. The local Windows vp test runner currently exits before suite registration with Vitest failed to find the current suite; CI should provide the authoritative test result.
Generated with Codex (GPT-5.6-sol).
@SunkenInTimeSunkenInTime
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Aug 30, 2026
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