Comment 2 for bug 444358
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| Mario Kemper (Romario) (mario-kemper) wrote | #2 |
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bbfa235
(Get the code!)
Sorry for the short explanation - I was in a hurry.
The "Section" function queries the window tree information (a window consists of many subwindows) by calling an xlib function, XQueryTree. Before Gtk+ 2.18 most of the widgets had a corresponding xwindow. The information about the subwindows were used to detect them and draw a rectangle around them that illustrated their geometry.
The new Ubuntu release (Karmic Koala 9.10) delivers the latest Gnome and Gtk+ versions where GDK has been changed to use client-side windows. This means that the XServer no longer knows about the subwindow hierarchy of a Gtk+ window and we can't use the XQueryTree function any longer. Qt4.x does use something similar. You can test this with an Qt4.x application window like VirtualBox if you don't have a karmic installation available.
It is possible to query the children of a GDK-window, but this works only if your own application created that window. Shutter needs to get the children of foreign toplevel windows.
I don't have a clue how to fix that, but I'll send an e-Mail to the Gtk+ mailing list when I am back home. I'll post any answers here.