[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755

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JulieLeeMSFT merged 9 commits into
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[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
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Backport of #125754 to release/10.0

/cc @jkoritzinsky

Customer Impact

  • Customer reported
  • Found internally

Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.

Regression

  • Yes
  • No

Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native

Testing

[How was the fix verified? How was the issue missed previously? What tests were added?]

Added unit tests to validate the behavior. Also, the fix has been validated internally

Risk

[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]

Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.

IMPORTANT: If this backport is for a servicing release, please verify that:

  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).

Package authoring no longer needed in .NET 9

IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.
Keep in mind that we still need package authoring in .NET 8 and older versions.

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github-actionsBotforce-pushed the backport/pr-125754-to-release/10.0 branch from c7ca0f6 to b07bd21CompareMarch 20, 2026 17:44
jkoritzinskyand others added 7 commits March 20, 2026 17:50
@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
@github-actions
github-actionsBotforce-pushed the backport/pr-125754-to-release/10.0 branch from b07bd21 to 65ad18bCompareMarch 20, 2026 17:50
@AaronRobinsonMSFTAaronRobinsonMSFT added the Servicing-consider Issue for next servicing release review label Mar 20, 2026
@AaronRobinsonMSFTAaronRobinsonMSFT added this to the 10.0.x milestone Mar 20, 2026
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@jkoritzinsky, please check test failures. Then, we can merge.

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Test failures are all unrelated. We're good to merge.

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/ba-g timeouts on legs that don't touch where this change runs

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JulieLeeMSFT merged commit 87494dc into release/10.0Mar 23, 2026
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JulieLeeMSFT deleted the backport/pr-125754-to-release/10.0 branch March 23, 2026 17:55
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
Merged
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
Mar 23, 2026
Merged
[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
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Mar 18, 2026•

edited by AaronRobinsonMSFT

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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
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/ba-g timeouts on legs that don't touch where this change runs
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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('^' + ".*" + '

Skip to content
[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
Merged
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
Mar 23, 2026
Merged
[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
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@github-actions
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Mar 18, 2026•

edited by AaronRobinsonMSFT

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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
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/ba-g timeouts on legs that don't touch where this change runs
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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");
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
Merged
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
Mar 23, 2026
Merged
[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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March 20, 2026 17:50
@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
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/ba-g timeouts on legs that don't touch where this change runs
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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
[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
Merged
JulieLeeMSFT merged 9 commits into
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backport/pr-125754-to-release/10.0
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Merged
[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
@github-actions
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
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/ba-g timeouts on legs that don't touch where this change runs
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merged commit 87494dc
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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('^' + ".*" + '

Skip to content
[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
Merged
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
Mar 23, 2026
Merged
[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
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Mar 18, 2026•

edited by AaronRobinsonMSFT

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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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added 7 commits
March 20, 2026 17:50
@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
@github-actions
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
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/ba-g timeouts on legs that don't touch where this change runs
@JulieLeeMSFT
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merged commit 87494dc
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release/10.0Mar 23, 2026

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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
[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
Merged
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
Mar 23, 2026
Merged
[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
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@github-actions
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commented
Mar 18, 2026•

edited by AaronRobinsonMSFT

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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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jkoritzinskyand others
added 7 commits
March 20, 2026 17:50
@jkoritzinsky
Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
@github-actions
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
@jkoritzinsky
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/ba-g timeouts on legs that don't touch where this change runs
@JulieLeeMSFT
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merged commit 87494dc
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release/10.0Mar 23, 2026

143 of 150 checks passed

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March 23, 2026 17:55
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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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[release/10.0] Clear RCW cache entries when releasing wrapper objects - #125755
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JulieLeeMSFT merged 9 commits into
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backport/pr-125754-to-release/10.0
Mar 23, 2026
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[release/10.0] Clear RCW cache entries when releasing wrapper objects#125755
JulieLeeMSFT merged 9 commits into
release/10.0from 
backport/pr-125754-to-release/10.0
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Mar 18, 2026•

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Backport of #125754 to release/10.0
/cc @jkoritzinsky
Customer Impact
  •  Customer reported
  •  Found internally
Found by the Microsoft Store team when they were working on migrating PurchaseApp from .NET Native. Before this change, user code could receive an invalid, cleared RCW from ComWrappers, resulting in unexpected exceptions after any XAML thread has exited.
Regression
  •  Yes
  •  No
Technically a regression from .NET Core 3.1's built-in WinRT support and .NET Native
Testing
[How was the fix verified? How was the issue missed previously? What tests were added?]
Added unit tests to validate the behavior. Also, the fix has been validated internally
Risk
[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]
Low risk as this only kicks in in WinRT XAML scenarios and is not observable for single-threaded WinRT XAML apps.
IMPORTANT: If this backport is for a servicing release, please verify that:
  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).
Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.

Keep in mind that we still need package authoring in .NET 8 and older versions.
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Tagging subscribers to this area: @dotnet/interop-contrib

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Remove native wrappers from the RCW cache in the tracker support glob…
e46e0d4
…al instance when releasing external objects for the Jupiter runtime
@jkoritzinsky
PR feedback and add a test
6415f93
@jkoritzinsky
TrackerObject
b6aed23
@jkoritzinsky
Update GlobalInstance.cs
c25e62c
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Update TrackerObjectManager.cs
ba155b0
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@jkoritzinsky
Move object collection for ReleaseObjects to only be for the global t…
b6d1165
…racker instance
@jkoritzinsky
Reorder DisconnectTracker call in TrackerObjectManager
65ad18b
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@jkoritzinsky, please check test failures. Then, we can merge.
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Test failures are all unrelated. We're good to merge.
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/ba-g timeouts on legs that don't touch where this change runs
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