patch 8.2.1948: GUI: crash when handling message while closing a window

Problem:    GUI: crash when handling message while closing a window. (Srinath
            Avadhanula)
Solution:   Don't handle message while closing a window. (closes #7250)
diff --git a/src/version.c b/src/version.c
index 015cf4c..d380452 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1948,
+/**/
     1947,
 /**/
     1946,