I'm using Qt for a VST3 plugin, inside a non-Qt host application (Studio One).
As soon as the QApplication object is created inside my VST3 plugin, all the host application native menus disappear (only the "Studio One" application menu remains, but with a minimal set of items that has nothing to do with what was initially there).
I suppose the root of the problem would be in src/plugins/platforms/cocoa/qcocoamenuloader.mm or qcocoamenubar.mm.
This is VERY problematic.
Any workaround to prevent that ?