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6a8a334426
Apps need per-click decisions to follow the macOS convention of accepting first mouse for low-risk actions (selection, scrolling) but rejecting it for buttons and destructive actions. Motivated by slint-ui/slint#10451. Always return `true` from `acceptsFirstMouse:`, and tag the resulting `PointerButton` events with `is_macos_activation_click: true` (on both the activating left press and its matching release) so the app can short-circuit the whole gesture with a single check: WindowEvent::PointerButton { is_macos_activation_click: true, .. } => return, Replaces an earlier callback-based design (`accepts_first_mouse` on `ApplicationHandlerExtMacOS`) that mapped more closely to AppKit but didn't fit winit's event-driven model and required re-entrancy handling. Also removes `WindowAttributesMacOS::with_accepts_first_mouse`, which is now redundant — apps that want to reject activation clicks check the flag on the per-event instead.