Re: Redisplay problems?

[Eli Zaretskii]

> Date: Fri, 21 Mar 2014 09:03:39 +0100
> From: martin rudalics <address@hidden>
> CC: address@hidden, address@hidden, address@hidden, 
>  address@hidden, address@hidden
> 
>  >> But it's a redraw when we expose a hitherto invisible/obscured frame
>  >> whose contents have changed while it was invisible/obscured.
>  >
>  > If the glyph matrices of such a frame were updated when the contents
>  > changed, then there's no need to recompute them at expose event time.
> 
> But wasn't the whole idea of maintaining an "obscured" state to not
> update the glyph matrices when a change occurs while the frame is
> obscured but instead to wait until the frame gets exposed again?

Maybe so, but then what exactly is the problem we are discussing here?
If the current glyph matrices are not up to date, marking the frame
"garbaged" is the only way to redisplay it.