Robert Ancell 5d5355f48d
Show window on first frame on Linux (#170844)
Wait for the first Flutter frame before showing the window. This avoids
showing a window with empty Flutter content, which defaults to a black
background.

Part of https://github.com/flutter/flutter/issues/55427
Fixes https://github.com/flutter/flutter/issues/118269
2025-06-22 22:46:36 +00:00
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