macos: fix broken accounting messages and click after moving the window
This MR contains a few small fixes for macOS:
- Fix "Broken accounting" messages: GdkMacosWindow does not need to explicitly release grabs. It looks like the event flows covers that.
- The property
NSWindow.showsResizeIndicator
is deprecated and doesn't do anything. It's alwaysFALSE
, so the code block is never executed. - 0ea35efe fixed an issue with double emission of button release events. However, after that fix, the user had to do an extra click to use the window after moving. The event should be propagated if we performed a (manual) move of the window.