patch 8.1.0349: crash when wiping buffer in a callback
Problem: Crash when wiping buffer in a callback.
Solution: Do not handle messages when only peeking for a character.
(closes #2107) Add "redraw_flag" to test_override().
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 6408165..d51b92c 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -8737,6 +8737,7 @@
name effect when {val} is non-zero ~
redraw disable the redrawing() function
+ redraw_flag ignore the RedrawingDisabled flag
char_avail disable the char_avail() function
starting reset the "starting" variable, see below
nfa_fail makes the NFA regexp engine fail to force a