patch 9.0.0824: crash when using win_move_separator() in other tab page Commit: https://github.com/vim/vim/commit/873f41a0187e81a22aa4622fbf938de72a54abba Author: zeertzjq <zeertzjq@outlook.com> Date: Tue Nov 1 11:44:43 2022 +0000 patch 9.0.0824: crash when using win_move_separator() in other tab page Problem: Crash when using win_move_separator() in other tab page. Solution: Check for valid window in current tab page. (closes #11479, closes #11427)

--- a/src/evalwindow.c
+++ b/src/evalwindow.c
@@ -889,6 +889,11 @@ f_win_move_separator(typval_T *argvars, 
     wp = find_win_by_nr_or_id(&argvars[0]);
     if (wp == NULL || win_valid_popup(wp))
 	return;
+    if (!win_valid(wp))
+    {
+	emsg(_(e_cannot_resize_window_in_another_tab_page));
+	return;
+    }
 
     offset = (int)tv_get_number(&argvars[1]);
     win_drag_vsep_line(wp, offset);