ID 376270 - "Add Tab" menu can appear on the wrong screen

Problem summary:

Large context menus that do not fit on the current screen may be relocated to the wrong screen. See video attached.

Steps to reproduce:

• Move the Katana window to the secondary screen.
• Resize any pane in a way that ensures that its Add Tab menu will not fit in the screen if displayed.
• Display the Add Tab menu of that pane.
• Expected:
      The menu should appear near the pressed button, in the closest position where it would appear if there was enough space.
• Actual:
      The menu appears in the wrong screen.

NOTE 1: You may have to load some Example plug-ins or Internal plug-ins, as you need a long menu to reproduce the issue.
NOTE 2: This may or may not be a Qt 5 issue. It is possible that we failed to correctly port some code.
NOTE 3: This may affect other context menus.

Tested versions/platforms:

• 3.0v7 - Unaffected
• 3.1dev #82 - Affected (first build with Qt 5)
• 3.1v1 - Affected