patch 9.1.1306: completion menu rendering can be improved

Problem:  Parts of the popup menu were rendered twice when the popup was
          at maximum width because the truncation flag was being set too
          liberally.
Solution: Make the truncation condition more precise by only setting it
          when there's exactly one character of space remaining
          (glepnir).

closes: #17108

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 7bd2bb6..166c76d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1306,
+/**/
     1305,
 /**/
     1304,