patch 8.1.1949: cannot scroll a popup window to the very bottom

Problem:    Cannot scroll a popup window to the very bottom.
Solution:   Scroll to the bottom when the "firstline" property was set to -1.
            (closes #4577)  Allow resetting min/max width/height.

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1949,
 /**/
     1948,
 /**/