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bug#2343: Color highlighting leaves a trail of cursors on the screen

From: David De La Harpe Golden
Subject: bug#2343: Color highlighting leaves a trail of cursors on the screen
Date: Thu, 19 Feb 2009 05:13:40 +0000
User-agent: Mozilla-Thunderbird (X11/20090103)

Chong Yidong wrote:
Kim Rose Carlsen <address@hidden> wrote:

Tested with terminal:
Gnome-terminal (term=xterm || term=linux)
xfce-terminal  (term=xterm || term=linux)
rox-terminal   (term=xterm || term=linux)

All those use the libvte terminal emulator widget underneath.
It _may_ be some issue with that rather than emacs, there is an unconfirmed bug report of various redraw issues in recent vte
when cursor positioning is used:

Cannot reproduce with linux console (term=linux || term=xterm)
xterm (term=xterm || term=linux)

I'm pretty baffled by this one.  I can reproduce it using
gnome-terminal, and a slightly different version of the bug seems to
show up in Emacs 22 too.  Anyone have any idea?

I can reproduce something like it with xfce4-terminal with

emacs -nw -Q

Without -Q, I have my usual non-default dark blue background set on my default face in emacs, and then the block artifact doesn't appear, so maybe there's some place (whether in emacs or the vte widget I don't know) where a background redraw is being skipped when it shouldn't be,
probably as an optimisation for the terminal-default background case.

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