Issues

• Wrong cursor is shown when opening a TreeViewItem's context menu

  bugneeds-triageteam-Controls
  Bug

  microsoft/microsoft-ui-xaml#12184 · Filter by author DHancock opened on Oct 6, 2026
  1

• [WinUI OSS] Fix azp run cancellation Issue

  needs-triageWinUI OSS
  Bug

  microsoft/microsoft-ui-xaml#12176 · Filter by author harshit7962 opened on Oct 6, 2026
  

• [WinUI OSS] Automate the availability of Localization package to shine-oss

  needs-triageWinUI OSS
  Task

  microsoft/microsoft-ui-xaml#12175 · Filter by author harshit7962 opened on Oct 6, 2026

• [WinUI OSS] Target the PR to GH

  needs-triageWinUI OSS
  Task

  microsoft/microsoft-ui-xaml#12174 · Filter by author harshit7962 opened on Oct 6, 2026

• [WinUI OSS] Localization PRs now need to be targeted to GitHub

  needs-triageWinUI OSS
  Task

  microsoft/microsoft-ui-xaml#12173 · Filter by author harshit7962 opened on Oct 6, 2026

• SceneLightingEffect with NormalMapSource is lit from the wrong direction when the SpriteVisual has BorderMode.Soft (the default)

  bugneeds-triageteam-CompInput
  Bug

  microsoft/microsoft-ui-xaml#12171 · Filter by author dmitry-valyukov opened on Oct 5, 2026

• Window.VisibilityChanged is not raised when a window is hidden or shown, although Window.Visible changes

  area-Windowingbugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12160 · Filter by author KamilDev opened on Oct 5, 2026
  1

• Animations keep running in a hidden or minimized desktop Window: an active ProgressRing or indeterminate ProgressBar burns CPU on the compositor thread

  feature proposalneeds-triageteam-Controls
  Feature

  microsoft/microsoft-ui-xaml#12159 · Filter by author KamilDev opened on Oct 5, 2026

• MuxcActivationHandler's DLL-name fallback uses LoadLibraryW, so DLLs in AddDllDirectory directories are no longer found (WebView2 fails with 0x8007007E)

  area-Performancebugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12158 · Filter by author dlech opened on Oct 4, 2026
  1

  

• Proposal: Reduce WinUI native architecture outputs to x64 and ARM64

  feature proposalneeds-triage
  Feature

  microsoft/microsoft-ui-xaml#12157 · Filter by author hoshiizumiya opened on Oct 4, 2026

• UIElement.TransformToVisual called from C# leaves a native MatrixTransform that is never freed (~600 bytes per call)

  bugteam-Core
  microsoft/microsoft-ui-xaml#12156 · Filter by author nabystory opened on Oct 3, 2026
  6

• Proposal: Add built-in x:NameOf markup extension for compile-time safe member names in XAML

  feature proposalneeds-triage
  Feature

  microsoft/microsoft-ui-xaml#12155 · Filter by author PaulTaro opened on Oct 3, 2026
  2

• Slider StepFrequency snaps relative to zero instead of Minimum

  bugneeds-triageteam-Controls
  Bug

  microsoft/microsoft-ui-xaml#12153 · Filter by author KeitaKayano opened on Oct 3, 2026

• [UWP] TextServicesHost::TimerWindowProc uses a freed CTextBoxBase: the host is leaked by msftedit's CTouchHandlerImpl, so its timer window outlives the TextBox

  needs-triage
  microsoft/microsoft-ui-xaml#12151 · Filter by author FrayxRulez opened on Oct 3, 2026

• LinedFlowLayout crashes in MeasureItemRangeRegularPath when the viewport is 0 and an item's desired width changes (empty frozen range -1..-1)

  bugneeds-triageteam-Controls
  Bug

  microsoft/microsoft-ui-xaml#12148 · Filter by author dmitry-valyukov opened on Oct 3, 2026
  1

• Proposal: Make XamlReader.Load async

  feature proposalneeds-triage
  Feature

  microsoft/microsoft-ui-xaml#12142 · Filter by author HO-COOH opened on Oct 2, 2026
  2

• One-pixel gap at top with FullScreen presenter and ExtendsContentIntoTitleBar

  area-Windowingbugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12138 · Filter by author JesseCol opened on Oct 1, 2026

• Experimental TableView crashes in a blank WinUI 3 application

  area-TableViewbugneeds-triageteam-Controls
  Bug

  microsoft/microsoft-ui-xaml#12115 · Filter by author ghost1372 opened on Sep 30, 2026
  11

• Proposal: Let apps with a render loop defer or opt out of the blocking GC.Collect() calls that WinUI makes on the UI thread (TrackMemory, TriggerCollectionForOrphanedObjects)

  feature proposalneeds-triage
  Feature

  microsoft/microsoft-ui-xaml#12113 · Filter by author janne-hmp opened on Sep 30, 2026

• Proposal: Stop allocating a new RenderingEventArgs and framework peer on every CompositionTarget.Rendering tick

  feature proposalneeds-triage
  Feature

  microsoft/microsoft-ui-xaml#12112 · Filter by author janne-hmp opened on Sep 30, 2026

• WinUI throws Child collection must not be modified during measure or arrange when VS XAML diagnostics are enabled and a virtualized item first loads a ResourceUri dictionary

  area-Toolingbugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12108 · Filter by author hoshiizumiya opened on Sep 30, 2026

• Proposal: Verify generated XamlCompiler T4 outputs in PR CI

  feature proposalneeds-triage
  Feature

  microsoft/microsoft-ui-xaml#12107 · Filter by author hoshiizumiya opened on Sep 30, 2026

• Application_Xaml partition discovery and Pass1 output reporting must survive incremental shortcuts

  area-XamlCompilerbugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12106 · Filter by author hoshiizumiya opened on Sep 30, 2026
  2

• Removing a XAML item can leave stale generated headers and bypass shared-output invalidation

  area-XamlCompilerbugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12105 · Filter by author hoshiizumiya opened on Sep 30, 2026

• XamlC incremental cache does not track XamlCodeGenerationControlFlags changes

  area-XamlCompilerbugteam-Core
  Bug

  microsoft/microsoft-ui-xaml#12104 · Filter by author hoshiizumiya opened on Sep 30, 2026