Public bug reported:

Binary package hint: compiz

Description:    Ubuntu lucid (development branch)
Release:        10.04

compiz:
  Installed: 1:0.8.4-0ubuntu15
  Candidate: 1:0.8.4-0ubuntu15
  Version table:
 *** 1:0.8.4-0ubuntu15 0
        500 http://gb.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

System->Preference->Appearance, "Visual Effects" tab.  Selected "Normal"
option.  When using OpenGL graphics, invalid SDL_ACTIVEEVENT events are
generated each time a mouse button is clicked within the OpenGL
application window.  This causes the application to think it has lost
mouse focus; which is causing an issue with a game I help on (Eternal
Lands).  The expected behaviour is that no SDL_ACTIVEEVENT events are
generated for mouse button clicks.  This is indeed the behaviour when
the  "Visual Effects" tab has "None" selected.

I have hacked together a simple demonstration program based on an
example I found on the web (link on the source).  This demonstration
program gives the following output:

"Visual Effects" tab  "None":
SDL_ACTIVEEVENT 1 0 1
SDL_ACTIVEEVENT 1 1 1
Mouse Press button: 1  x: 381 y: 302
Mouse Press button: 3  x: 381 y: 302
KeyPress Event: escape

"Visual Effects" tab  "Normal":
SDL_ACTIVEEVENT 1 0 1
SDL_ACTIVEEVENT 1 1 1
SDL_ACTIVEEVENT 1 0 1
SDL_ACTIVEEVENT 1 1 1
Mouse Press button: 1  x: 323 y: 220
SDL_ACTIVEEVENT 1 0 1
SDL_ACTIVEEVENT 1 1 1
Mouse Press button: 3  x: 323 y: 220
KeyPress Event: escape

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Invalid SDL_ACTIVEEVENT events generated on mouse clicks when compiz enabled
https://bugs.launchpad.net/bugs/566856
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