patch 8.1.1770: cannot get the window ID of the popup preview window
Problem: Cannot get the window ID of the popup preview window.
Solution: Add popup_getpreview().
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 3875b43..8253df8 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -715,6 +715,7 @@
{"popup_filter_yesno", 2, 2, f_popup_filter_yesno},
{"popup_getoptions", 1, 1, f_popup_getoptions},
{"popup_getpos", 1, 1, f_popup_getpos},
+ {"popup_getpreview", 0, 0, f_popup_getpreview},
{"popup_hide", 1, 1, f_popup_hide},
{"popup_locate", 2, 2, f_popup_locate},
{"popup_menu", 2, 2, f_popup_menu},