[Windows] Verify: flashes and blank frames on start, show, restore and maximize #75

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1. lijy91

   added

   bugSomething isn't workingSomething isn't working

   on Sep 21, 2026
2. lijy91

   added a commit that references this issue on Oct 7, 2026

   Show a window maximized before its first show maximized (#75)

   ...

   9d6b50d
3. lijy91 commented on Oct 7, 2026

   

   lijy91

   on Oct 7, 2026

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   Replayed with the real nativeapi Flutter Window API in a real Flutter Windows app (Windows 11 build 26200, Flutter 3.47.6 debug): tools/gui/flutter_window_reports_test.ps1 builds the fixture tools/gui/window_reports_flutter.dart against the workspace's Dart packages, paints solid colours, and measures native geometry, styles, DWM caption buttons, pixels and frame-by-frame samples. No keyboard input; the only clicks are owner-guarded ones on the app's own window. The suite passes repeatedly on core 9d6b50d (workspace libnativeapi/nativeapi@2894880).

   • #428 — no white or black frame at startup (frames sampled from process start; the window only appears with its content).
   • #504 / #223 — sized and center()ed before the first frame: it appears where it stays, centred (as Windows measures the window, invisible resize borders included), no jump.
   • #412 / #572 — reproduced and fixed (9d6b50d): maximize() before the first show showed the window maximized at once, and the Flutter runner's own first-frame ShowWindow(SW_SHOWNORMAL) then restored it to the default size, with a black frame on the way. Maximize() on a window that is not shown yet now keeps it hidden with the request recorded; whatever shows it, it appears maximized from its first visible frame (IsMaximized() reports the request, Unmaximize() takes it back). Now: maximized from the first sample, still maximized 2 s later. Core test: window_startup_maximize_windows_test.
   • #383 — no white or black frame while maximize() runs (~50 frames per point).
   • #153 — no black frame while restoring from maximized.
   • #155 — no white or black frame once the window is visible again after hide() / show().
   • #578 — the window dragged by its title bar until 40 % is off screen and back (real owner-guarded drag): the uncovered part shows content at the first sample after release.

   All eight checked; closing.
4. lijy91

   closed this as completedon Oct 7, 2026