acme: fix hiding of top windows when loading a dump file (thanks Xiao-Yong)

When loading an acme dump file that contains a window with only one
tag line, there are cases where acme hides that window (i.e.  not even
its tag is visible).

The following commands reproduce the issue:

 % ed <<EOE
1
i
/tmp
/lib/font/bit/pelm/unicode.8.font
/lib/font/bit/pelm/unicode.8.font
          0
f          0           5         175         175           1
          5          40         175           1           0 /sys/src/cmd/acme/ Del Snarf Get | Look
f          0           4         330         330           3
          4          27         330           1           0 /tmp/ Del Snarf Get | Look
.
,w /tmp/test.dump
Q
EOE
 % window -dx 900 -dy 600  'acme -l /tmp/test.dump'

This issue was introduced in commit 47b7dc5ccd77bc247ab15cfab3a7a8f955771c70.

0 files changed, 0 insertions, 0 deletions