patch 8.1.0135: undo message delays screen update for CTRL-O u commit https://github.com/vim/vim/commit/e0429681aed5448d1c3b8399d152a2b1a05ea6d7 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jul 1 16:44:03 2018 +0200 patch 8.1.0135: undo message delays screen update for CTRL-O u Problem: Undo message delays screen update for CTRL-O u. Solution: Add smsg_attr_keep(). (closes https://github.com/vim/vim/issues/3125)

--- a/src/proto.h
+++ b/src/proto.h
@@ -119,6 +119,12 @@ int
 #  ifdef __BORLANDC__
 _RTLENTRYF
 #  endif
+smsg_attr_keep(int, char_u *, ...);
+
+int
+#  ifdef __BORLANDC__
+_RTLENTRYF
+#  endif
 vim_snprintf_add(char *, size_t, char *, ...)
 #ifdef USE_PRINTF_FORMAT_ATTRIBUTE
     __attribute__((format(printf, 3, 4)))