I see the problem you are trying to solve, but I don't think it's worth it to maintain a separate code path for this legacy mode that conflicts with the platform behavior.

tor arne

On 20/04/2017 00:04, René J. V. Bertin wrote:
Hi,

I went ahead and tinkered with Qt4's code:

https://github.com/RJVB/shortcut-test-qt5/blob/master/mainwindow.cpp#L302

QCocoaWindow inherits only QObject, not QWidget or QWindow, so implementing this
logic in the Cocoa QPA was a bit more work but not impossible:

https://cgit.kde.org/scratch/rjvbb/osx-integration.git/tree/src/qcocoa-qpa/qcocoawindow.mm?h=qt590#n1906

This PoC implementation applies the "legacy" (old-style) fullscreen mode to
windows without the fullscreen titlebar button, and when QT_LEGACY_FULLSCREEN is
set. In the latter case it appears to be a good idea to unset
Qt::WindowFullscreenButtonHint because otherwise certain events restore the
window frame (decoration).

R

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