macOS: Manually compute frame rect for zoomed/maximized state

We cannot rely on AppKit to compute the zoomed frame for us, as it will
not allow borderless windows to be zoomed, and also has bugs in corner
cases with multiple screens, where the zoomed window jumps from the
current screen to a nearby screen.

The latter happens when the zoomed rect overlaps more with a nearby
screen than it does with the current screen. In this case AppKit zooms
the window on the nearby screen, but this is unexpected from the user's
perspective, who zoomed the window on the current screen, so we make
sure to always keep the window on the current screen by repositioning
the window correspondingly.

Task-number: QTBUG-67543
Change-Id: I8762c5cbf2e3b317a6caf11d820712596e15114a
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

0 files changed, 0 insertions, 0 deletions