patch 8.1.1446: popup window callback not implemented yet
Problem: Popup window callback not implemented yet.
Solution: Implement the callback.
diff --git a/src/structs.h b/src/structs.h
index f6db264..2100135 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2894,6 +2894,7 @@
int w_border_char[8]; // popup border characters
varnumber_T w_popup_last_changedtick; // b:changedtick when position was
// computed
+ callback_T w_close_cb; // popup close callback
callback_T w_filter_cb; // popup filter callback
# if defined(FEAT_TIMERS)
timer_T *w_popup_timer; // timer for closing popup window