macOS: Mouse Up is not delivered correctly after drag and drop

Observation:

The mouse up event concluding a drop and drop operation does not contain the originating button id, and leads to undefined behavior in code, which is relying on complete informations about which button was released.

Analysis:

The root cause is the button id to be hardcoded to Qt::NoButton, see: https://github.com/qt/qtbase/blob/6.6.1/src/plugins/platforms/cocoa/qnsview_dragging.mm#L289

Attached:

Proposed patch (this is based on 6.5.3, but should be no problem to apply to earlier or later Qt revisions, even if maybe not completely conflict-free)

EDITED - sorry I had the attachment wrongly labelled as 6.3.2-based, which is corrected now.