patch 8.1.1446: popup window callback not implemented yet commit https://github.com/vim/vim/commit/9eaac896501bcd6abdd430a90293eae8101df24a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jun 1 22:49:29 2019 +0200 patch 8.1.1446: popup window callback not implemented yet Problem: Popup window callback not implemented yet. Solution: Implement the callback.

--- a/src/window.c
+++ b/src/window.c
@@ -4845,6 +4845,7 @@ win_free(
     remove_winbar(wp);
 #endif
 #ifdef FEAT_TEXT_PROP
+    free_callback(&wp->w_close_cb);
     free_callback(&wp->w_filter_cb);
     for (i = 0; i < 4; ++i)
 	VIM_CLEAR(wp->w_border_highlight[i]);