Have focus-stealing modal dialogs ignore "always on top" rule of other windows

[PeterParker]

This issue was originally TRAC 8468

Mantid does not accept any mouse input under a certain set of circumstances and has to be closed unless the Alt+F4 keyboard shortcut is used. To reproduce:

• Open up the Python scripting window and place it in a position similar to that shown in the attached image.
• Set the Python window to be "Always on Top".
• Type "Load" and press enter into the Algorithm field as shown in the image.

The [http://qt-project.org/doc/qt-4.8/qwidget.html#modal-prop modal] nature of the dialog means that you can't click outside of the dialog, but the Python scripting window will block you from clicking on the dialog!

Use Alt+F4 to close the dialog and regain control of Mantid.

I've set this to minor since this will probably be quite a rare occurrence.

[PeterParker]

@NickDraper (2014-02-14T11:07:58):
bulk move to assigned at the into of the triage step

[PeterParker]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/8468/Screenshot.png

(uploaded by @PeterParker on 2013-11-18T12:40:45)

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[NickDraper]

dialog windows are no longer modal

so works4me