patch 8.1.1739: deleted match highlighting not updated in other window
Problem: Deleted match highlighting not updated in other window.
Solution: Mark the window for refresh. (closes #4720) Also fix that
ambi-width check clears with wrong attributes.
diff --git a/src/testdir/dumps/Test_matchdelete_1.dump b/src/testdir/dumps/Test_matchdelete_1.dump
new file mode 100644
index 0000000..06b16b5
--- /dev/null
+++ b/src/testdir/dumps/Test_matchdelete_1.dump
@@ -0,0 +1,12 @@
+> +0&#ffffff0@74
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|[+3#0000000&|N|o| |N|a|m|e|]| @47|0|,|0|-|1| @9|A|l@1
+|H+0&&|e|l@1|o| |V|i|m| |w|o|r|l|d| @59
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|[+1#0000000&|N|o| |N|a|m|e|]| |[|+|]| @43|1|,|1| @11|A|l@1
+|:+0&&|c|a|l@1| |m|a|t|c|h|d|e|l|e|t|e|(|m|i|d|,| |w|i|n|i|d|)| @45