In 5.7.0, QKeySequence will no longer match a shortcut such as "*" or "?" that require the shift key to access (e.g. Shift+/ in the latter case) on Mac OS X.

You can see this behaviour with the test app attached to QTBUG-50360. This also went wrong in 5.5, was fixed in 5.5.1, went wrong again during 5.6 development and was fixed for the 5.6.0 release: see QTBUG-47122 and lots of others.

This time the culprit seems to be the fix for QTBUG-50865. The last part of the change to QCocoaKeyMapper::possibleKeys changes this line

ret << int(key + (keyMods & ~neededMods))

to this:

ret << int(key + neededMods)

and that seems to make it go wrong. For what it's worth, the former code is exactly what is used by the Windows back end.