Clicking outside the modeless window (the child window in my example), hides this window under its parent.
The following sample demonstrates the problem. This problem does not exist in Windows.
Changing Qt::Window for Qt::Tool allows the window to float, but above all main windows and not only the parent window.
|For Gerrit Dashboard: QTBUG-34767|
|95044,4||OS X: modeless dialog window.||5.3||qt/qtbase||Status: ABANDONED||0||0|
|95232,1||OS X: transient parent and child window's level||5.3||qt/qtbase||Status: ABANDONED||0||0|
|244956,7||Document that dialog parent relationship does not imply stacking order||5.12||qt/qtbase||Status: MERGED||+2||0|