BUG #13991: Fix window size in tile-display mode.

The window size was being reset when a view was split. This fixes that issue.

Change-Id: I643662fb7cc4864a3c0d48e9a86f35c054c38053
Merge topic '13991_fix_window_sizes' into next

b65ee58 BUG #13991: Fix window size in tile-display mode.