Havoc Pennington:

Not exactly correct.

IMO this is a UI bug (not Adobe specific).

Changing the volume using keyboard shortcuts in Ubuntu (and other Linux
distros) takes the focus out of the active gnome widget temporarily.

This can cause annoying flicker if the currently focused widget displays
some form of focus rectangle or other visual indication that the widget
has the focus.

This is the reason for example for the behavior described by bladedot in
comment #17. In Firefox, when the keyboard focus is on a hyperlink, the
status bar displays the target address of the link. When the focus
leaves a hyperlink, Firefox reverts the status bar text to some other
value (in this case "Done"). This is why, when changing the volume the
status bar in Firefox changes temporarily. This same effect of visual
flicker can be observed in any GNOME application under different
circumstances.

I have no idea what the reason for stealing keyboard focus when reacting
to shortcut keys and/or displaying notifications is - but from the
user's perspective there is no good reason to do this, and many reasons
not to do this - the best one being the Adobe Flash player fullscreen
behavior, which apparently exits fullscreen mode on losing keyboard
focus.

I have no idea whether this is GNOME-specific of Ubuntu-specific, but I
know it needs to be fixed, and it would be much easier to get this fixed
in an open source project - GNOME or Ubuntu, than trying to get Adobe
the change their closed-source Flash player, for a very tiny part of
their audience.

Thanks.

-- 
Changing sound volume with special keys causes Flash to exit full screen
https://bugs.launchpad.net/bugs/224475
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