In task-xfce-4.12-4.mga6 on Mageia Linux v6 x86-64, if I open a konsole window and two gvim windows (in their default placement), then doing alt+tab does not highlight one of the gvim windows with a frame. I'm not using compositing. xfwm4 is at xfwm4-4.12.3-2.mga6 (I could only find 4.12.0 in the version selection listbox). It is demonstrated here: http://www.shlomifish.org/Files/files/video/xfce-bug-no-hilited-frame-on-alt-tab-on-two-gvim-windows--mgav6-x86-64-linux.ogv . Also see: https://bugzilla.xfce.org/show_bug.cgi?id=6787#c1 .
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