patch 8.1.1645: cannot use a popup window for a balloon
Problem: Cannot use a popup window for a balloon.
Solution: Add popup_beval(). Add the "mousemoved" property. Add the
screenpos() function.
diff --git a/src/proto/move.pro b/src/proto/move.pro
index ed45c4d..c2ec8d5 100644
--- a/src/proto/move.pro
+++ b/src/proto/move.pro
@@ -27,6 +27,7 @@
int win_col_off2(win_T *wp);
int curwin_col_off2(void);
void curs_columns(int may_scroll);
+void f_screenpos(typval_T *argvars, typval_T *rettv);
void scrolldown(long line_count, int byfold);
void scrollup(long line_count, int byfold);
void check_topfill(win_T *wp, int down);