Prevent toolbox getting lost when minimising windows

On X, window managers don't like WM_TRANSIENT_FOR being altered while a
window is visible; this meant that if you opened TikZiT and opened a
second main window and minimised the main window that had focus, the
toolbox and properties window would both disappear, with no way to get
them back (well, almost - the properties window could be retreived with
the menu item that shows/hides it).

Tested with KWin, Metacity (Gnome 2's WM), Mutter (Gnome 3) and xfwm4
(XFCE 4).  Metacity and Mutter still behave a little oddly - you have to
click one of the main windows *twice* to get it to focus.  KWin and
xfwm4 work fine.

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