[Xcb] Expose events on focus change

Barton C Massey bart at cs.pdx.edu
Mon Aug 16 12:39:27 PDT 2010

Pretty sure this is not an XCB bug, anyhow.  You might want
to try xorg-devel at lists.freedesktop.org .

It's possible that the events you're seeing are from border
highlighting that may or may not be happening, drawn as
overlapping rectangles or somesuch.  But it's hard to know
without knowing specifics of your setup.


In message <201008160921.39816.doomster at knuut.de> you wrote:
> I just stumbled over something that worries me a bit and
> where I'm not sure whether it is intended or not. I
> noticed that when I move my mouse or use a key combo to
> switch focus to/from a window it gets "expose"
> events. This is my first issue, why should a window be
> repainted just because it gained or lost focus?
> Secondly, I noticed that it isn't just one such event but
> several of them!  When losing focus, I get two expose
> events, when gaining focus I get four expose events. Note
> that these numbers already account for the fact that the
> exposure comes in multiple events each exposing one
> rectangle, otherwise I would have several times as many.
> Notes:
>  - I'm using the shape extension, haven't tried non-shaped windows yet.
>  - I'm using fluxbox, still need to try a different WM.
>  - There already is a bug report which sounds related: 
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=544112
> I can actually turn this off by simply announcing to the
> WM that I don't ever want focus (xcb_wm_hints_set_input),
> but that neither changes Debian bug #544112 nor does this
> give sense to the behavior otherwise.
> Can someone clarify whether I'm seeing expected behavior or a bug?
> Uli

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