On Wed, Feb 03, 2016 at 11:10:22PM +0900, Kazunobu Kuriyama wrote: > Marius, > > Just to make sure. > > Do you use the gvim on an X11 with a compositor or on a VM?
I run gnome-shell, which is a compositor. I run on native hardware
(Intel video on a ThinkPad X220).
> Looking at the pictures you kindly uploaded, I can see what is cleared by
> vim still remains on the screen. It's just like as if clear window/block
> clear operations were intentionally skipped
But not all of them -- just some character cells! And only when
scrolling forwards -- hitting PageUp redraws the screen correctly!
It's as if clearing works, but outputting "text with spaces" skips
clearing the background behind each space character.
> Actually, if I comment out drawing functions for clearing the window or a
> block, I get a similar phenomenon in you reports.
>
> To deepen our understanding on the issue, I'd like to hear your thoughts on
> possible causes of the failure of the clear operation.
Could it be that vim computes the width of a space incorrectly (e.g. 0
pixels) because it has no visible pixels? Or maybe the glyph is missing
in a font (because it's empty) and so it doesn't get drawn?
Perhaps I'll find some time to debug this, as it seems like an
interesting problem -- I'm a bit daunted since I've no familiarity with
gvim's GUI drawing code, and also almost no familiarity with GTK+/Cairo
text drawing APIs.
Regards,
Marius Gedminas
--
Life begins when you can spend your spare time programming instead of
watching television.
-- Cal Keegan
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