Add note aboute using `inverse-video' to detect excessive screen redraw.

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/DEBUG b/etc/DEBUG
index 42b965b098..2a61827c3c 100644
--- a/etc/DEBUG
+++ b/etc/DEBUG
@@ -112,3 +112,8 @@ If you have irreproducible display problems, put those two expressions
 in your ~/.emacs file.  When the problem happens, exit the Emacs that
 you were running, kill it, and rename the two files.  Then you can start
 another Emacs without clobbering those files, and use it to examine them.
+
+An easy way to see if too much text is being redrawn on a terminal is to
+evaluate `(setq inverse-video t)' before you try the operation you think
+will cause too much redrawing.  This doesn't refresh the screen, so only
+newly drawn text is in inverse video.