Re: Window flickering (Was: Question on mini windows)

[Richard Frith-Macdonald]

On 11 Jan 2008, at 21:26, Fred Kiefer wrote:

> Richard Frith-Macdonald wrote:
> > > I patched my version of GNUstep to draw the flickering windows  
> > > off the
> > > screen and suffered no ill effects.
> >
> > Yes, the only problem with that is that, if the window is off-screen,
> > the window manager is under no obligation to decorate it ... so  
> > whether
> > or not it works is window-manager dependent.
> >
> > That being said, as the common window-managers seem to decorate the
> > window whether it's off-screen or not, perhaps the best thing to do
> > would be to create the windows off-screen normally, and have an
> > NSUserDefault value to tell the backend to do it on-screen so that
> > people can try that if the off-screen method doesn't work with their
> > window manager.
>
> That change didn't work well for me using KDE. Looks like the window
> manager moves the windows on screen when displaying, so now the  
> windows
> show up close to the border. This isn't worse than before, so no  
> reason
> to take the change back.
> Looks like I have to wait for KDE 4 for this to go away.

Well maybe the change I did was not ideal ... the original code  
waited for the widow to become visible ... on the basis that when the  
window is visible it must have been fully decorated.  The off-screen  
version obviously can't do that (the window never becomes visible) so  
it just waits to be reparented.  maybe there is something else we  
could wait for, or perhaps we should just wait an extra few tenths of  
a second in case the window manage is going to reposition the window  
in some other way?

Perhaps David's off screen code does a better job and he could take a  
look and improve things?