panel redraw bug - occasional

[Craig Ringer]

Hi all

I'm currently using XFCE4rc1 (I'll test this against rc2 shortly, but 
want to ask about it while I remember), and I've noticed an occasional 
odd quirk with the panel draw/redraw.

The panel is set to auto-hide.

Essentially, it seems that if the panel draw is only partially complete 
when the panel goes back to hide mode, xfce never attempts to finish 
drawing the contents. All buttons etc work as expected, but the regions 
of the panel that weren't properly drawn never have their contents 
updated, they remain the window background colour. Interestingly, the 
highlighting used to outline the current active button /is/ drawn.

It looks like xfce4-panel essentially consders the panel's contents 
"already drawn" and must be restoring a stored copy of the image when it 
pops the panel back up. Great idea, but it doesn't seem to already keep 
a /correct/ copy of the drawn panel contents.

This is most commonly seen on slow links, such as our LTSP workstations 
at work. However, I've seen it on my 1.5Ghz athlon (760mb RAM, fast 
HDDs) so it's clearly not confined to slow graphics situations.

I'll see if I can reproduce it with rc2 when I get a chance, and let you 
know how it goes.

BTW, I was wondering if there was a panel or systray battery monitor 
plugin. It'd be awfully handy, since I use XFCE4 on my laptop too.

Craig Ringer