AppKit: Expose native transition state#4610
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Summary
This exposes AppKit native transition state through
WindowExtMacOS:WindowExtMacOS::is_live_resizing()for AppKit live-resize transitions.WindowExtMacOS::is_fullscreen_transition()for native fullscreen enter/exit transitions.It also keeps macOS maximized state cached so callers can poll
Window::is_maximized()without forcingNSWindow.isZoomedto temporarily mutate window style masks, and requests a final redraw when AppKit completes native fullscreen transitions.Motivation
Renderer integrations need to know when AppKit is driving native window transitions so they can synchronize surface presentation and avoid stale or stretched frames during live resize and fullscreen animations.
For a specific example see this egui PR emilk/egui#8280 that depends on this winit PR.
Checks
cargo +nightly fmt --checkcargo check -p winit --all-features