patch 9.1.0118: Use different restoration strategy in win_splitmove

Problem:  saving and restoring all frames to split-move is overkill now
          that WinNewPre is not fired when split-moving.
Solution: defer the flattening of frames until win_split_ins begins
          reorganising them, and attempt to restore the layout by
          undoing our changes. (Sean Dewar)

This also means we no longer must allocate.

related: #14042

Signed-off-by: Sean Dewar <6256228+seandewar@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 9ceb6ce..7de75e3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    118,
+/**/
     117,
 /**/
     116,