patch 7.4.1834

Problem:    Possible crash when conceal is active.
Solution:   Check for the screen to be valid when redrawing a line.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1834,
 /**/
     1833,
 /**/