[Qt] Inverted cursor position on Mac

[Felipe Monteiro de Carvalho]

Thanks, anxious here for 1.39 =)

And I hope that TRect and TPoint are the only problematic structures.

By the way, please add a Qt 4.2 version to 1.39

This will be the default Qt version that Lazarus supports.

-- 
Felipe Monteiro de Carvalho