patch 8.0.0243: tolower() does not work if the byte count changes
Problem: When making a character lower case with tolower() changes the byte
cound, it is not made lower case.
Solution: Add strlow_save(). (Dominique Pelle, closes #1406)
diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index 144324f..83384c0 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -40,6 +40,7 @@
char_u *vim_strnsave_up(char_u *string, int len);
void vim_strup(char_u *p);
char_u *strup_save(char_u *orig);
+char_u *strlow_save(char_u *orig);
void del_trailing_spaces(char_u *ptr);
void vim_strncpy(char_u *to, char_u *from, size_t len);
void vim_strcat(char_u *to, char_u *from, size_t tosize);