patch 9.0.0892: may redraw when not needed
Problem: May redraw when not needed, causing slow scrolling.
Solution: Do not redraw when w_skipcol doesn't change. When w_skipcol
changes only redraw from the top. (issue #11559)
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 04ccb48..1ac29b1 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -484,6 +484,7 @@
test_retab.res \
test_ruby.res \
test_scriptnames.res \
+ test_scroll_opt.res \
test_scrollbind.res \
test_search.res \
test_search_stat.res \