patch 8.1.1786: double click in popup scrollbar starts selection

Problem:    Double click in popup scrollbar starts selection.
Solution:   Ignore the double click.
diff --git a/src/version.c b/src/version.c
index 53ab0c9..0e30df7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -774,6 +774,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1786,
+/**/
     1785,
 /**/
     1784,