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fix(imaging): Keep a shared BitmapImage download alive when one requester cancels, drop failed loads from the cache (backport #25101) (backport #25915) - #25916
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agneszitte merged 4 commits intoNov 2, 2026
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…ster cancels The in-flight load cached by URI and decode size is awaited by every BitmapImage opening the same source, but it ran on the first requester's cancellation token. When that requester re-opened (a recycled ListView container binding a new UriSource), the shared task completed with a cancellation error, so every other BitmapImage for that URI raised ImageFailed and stayed blank, and nothing retried. The shared load now runs on no requester's token, as WinUI's ImageCache does when a request is released, and each requester waits under its own token so a cancelled open neither fails nor applies a stale result. Uncached loads (IgnoreImageCache or cache disabled) still cancel with their sole requester. Fixes #25096 Backport note: 6.x paths (BitmapImage.skia.cs, Uno.UWP/Helpers/LRUCache.cs, Tests/Windows_UI_Xaml_Media_Imaging); the changed lines are the same as on master. (cherry picked from commit a06c0a8) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit 9804660)
…led requester Uses a loopback server that holds the image bytes until released, so the test cancels the first requester while the download is deterministically in flight. Backport note: 6.x paths (BitmapImage.skia.cs, Uno.UWP/Helpers/LRUCache.cs, Tests/Windows_UI_Xaml_Media_Imaging); the changed lines are the same as on master. (cherry picked from commit cedc6b0) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit d6064f7)
A cached load that completes with an error stayed in the LRU until eviction, so one transient failure (offline moment, 503, DNS hiccup) kept failing every later BitmapImage for that URI with no retry. WinUI's provider store does not own its ImageCache: a failed one is dropped as soon as its requesters release it and the next request downloads again. The LRU owns its entries, so a continuation on the shared task now removes the entry when the load fails, guarded so it only removes the entry while it still holds that very task, as ImageProvider::RemoveImageCache does. Fixes #25096 Backport note: 6.x paths (BitmapImage.skia.cs, Uno.UWP/Helpers/LRUCache.cs, Tests/Windows_UI_Xaml_Media_Imaging); the changed lines are the same as on master. (cherry picked from commit b77bdb4) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit 998caa6)
…r requesters The gated server can answer the next request with an HTTP 500, so a BitmapImage opened after one failed must download again and open. Backport note: 6.x paths (BitmapImage.skia.cs, Uno.UWP/Helpers/LRUCache.cs, Tests/Windows_UI_Xaml_Media_Imaging); the changed lines are the same as on master. (cherry picked from commit 5254005) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit 5dc1d00)
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GitHub Issue: Related to #25096
PR Type:
🐞 Bugfix
What changed? 🚀
Manual backport of #25101 to
servicing/6.8, for 6.7 SR3. It builds on #25911 (theIgnoreImageCachefix, already on this branch).BitmapImages that open the same URI share one cached download. When one of them cancelled its open (for example a recycledListViewcontainer), the shared download was cancelled too, and the other images stayed blank. A failed download also stayed in the cache, so later images for the same URI failed as well.BitmapImage.skia.cs,LRUCacheis underUno.UWP/Helpers, and the test is underTests/Windows_UI_Xaml_Media_Imaging. The 4 commits are master's with only those paths changed; the changed lines are the same.PR Checklist ✅
Screenshots Compare Test Runresults.Local validation (Skia Desktop, Windows)
Runtime tests on this branch, filtered to
Tests.Windows_UI_Xaml_Media_ImagingandGiven_Image: 55 of 57 passed, including the 4Given_BitmapImagetests (3 of them new in this PR).Given_WriteableBitmap.When_WriteableBitmap_Assigned_With_Data_Presentfailed on its pixel check, the same as on this branch without the change. It doesn't useBitmapImage.Given_RenderTargetBitmap.When_Render_Border_GetPixelsAsyncwas inconclusive: it needs 100% display scaling.🤖 Generated with Claude Code
This is an automatic backport of pull request #25915 done by [Mergify](https://mergify.com).