On macOS 2.17.1 the UI started flashing garbage: text and Material icon
glyphs rendered as striped noise, and a keypress could flash a whole
glyph-atlas texture across the window. 2.17.0 on the same machine was fine.
2.17.1 moved to Flutter 3.47.1, which made Impeller the default macOS
renderer. Plezy is unusually exposed to that switch: MainFlutterWindow
clears the Flutter view to transparent so the mpv CAMetalLayer behind it
stays visible, so whatever Impeller leaves in the presented drawable is
blended onto the screen instead of being hidden under an opaque frame.
Opt out through the Info.plist switch the macOS embedder reads from the
main bundle at launch, so it applies to release builds too. That restores
the renderer every release up to 2.17.0 shipped; keep it until the engine
fixes for the 3.47 macOS Impeller regressions reach stable.
close#2132
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