Self explanatory.
How does this differ from Bug 439734?
menu rolling is about the single-stroke gesture downwards, this is simply about revealing the menu on mouse down instead of waiting for mouse up, regardless of whether or not the gesture is performed
So then this is a blocker for Bug 439734.
Upstream bug report: https://bugreports.qt.io/browse/QTBUG-107994 I tried patching qtdeclarative/ QQuickComboBox so that is opens popup on press (not release), but without proper touch point hand-over it is useless.