patch 7.4.2248

Problem:    When cancelling the :ptjump prompt a preview window is opened for
            a following command.
Solution:   Reset g_do_tagpreview. (Hirohito Higashi)  Add a test.  Avoid that
            the test runner gets stuck in trying to close a window.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2248,
 /**/
     2247,
 /**/