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Root cause of #15848 (and the long-standing macOS #6296 / Linux #3343 class): raw native texture pointers are shared across the platform thread, the engine raster thread and the video thread, with teardown ordered by a 100 ms sleep - or, when moving a tab to a new window, by nothing at all. A lost race frees the texture while it is still in use: the raster thread parks on a destroyed lock (frozen/black view, a never-presented 'transparent' hole, every later session black) and the video thread hangs while holding session locks (app half-dead until restart, still reported as Responding). - unregister textures with compare-and-clear (new session_unregister_* FFI): a late clear can no longer wipe a new window's registration (#8016) and Rust never keeps pushing into a freed texture; the 100 ms sleeps are gone (the plugins now drain in-flight pushes and defer object deletion until the raster thread is done) - guard the async texture create path against destroy racing it (#13596) - per-display locks: the per-frame plugin call no longer holds session-level locks, so a stalled plugin or driver call cannot freeze every window's UI thread - adopt the frame size after 30 consecutive mismatches instead of dropping frames forever (silent black screen on a live connection) - watchdog: frames pushed but never consumed by the engine fall the session back to software rendering live, record texture-render-health, and flip the effective default off; toggling the option clears the record and re-arms validation - Dart raster-stall monitor records a hung raster thread for the next launch (rendering cannot be rescued in-process in that state) - startup probe: render one frame through a 1x1 texture in the main window each launch; failure disables texture rendering before the first session goes black, a pass self-heals a stale failure record Platform defaults are unchanged (macOS off, Win10+ on, Linux on). Requires flutter_texture_rgba_renderer ad4c37e and flutter_gpu_texture_renderer 767bb9f (pinned in pubspec). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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