patch 8.1.2311: warning for missing function prototype
Problem: Warning for missing function prototype.
Solution: Add the proto. (Dominique Pelle, closes #5233)
diff --git a/src/proto/popupwin.pro b/src/proto/popupwin.pro
index 6e9b162..dafe657 100644
--- a/src/proto/popupwin.pro
+++ b/src/proto/popupwin.pro
@@ -7,6 +7,7 @@
int popup_is_in_scrollbar(win_T *wp, int row, int col);
void popup_handle_scrollbar_click(win_T *wp, int row, int col);
int popup_top_extra(win_T *wp);
+int popup_left_extra(win_T *wp);
int popup_height(win_T *wp);
int popup_width(win_T *wp);
int popup_extra_width(win_T *wp);