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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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The free-form entry fields (graph element properties and node labels)
are a potential source of invalid tikz code. Since we quote any
dodgy-looking text with { and }, we just need to make sure there are no
unmatched curly braces entered in those fields.
This will turn the entry widgets red when there are unmatched braces,
and refuse to make use of any such values.
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Brings back some old functionality, but in a more compact way.
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Code largely stolen from the GIMP.
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It's silly to have two copies of the same code in two different files.
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git-svn-id: https://tikzit.svn.sourceforge.net/svnroot/tikzit/trunk@392 7c02a99a-9b00-45e3-bf44-6f3dd7fddb64
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