As reported in 4615863 (problem3), subwindow size become smaller by
clicking "open window" button and "alt-F4".

What really happens is that a packed frame is being disposed and then
shown again and the code to calculate insets under X11 resizes the
frame incorrectly.

Filing this as a separate bug report for easier tracking.

 xxxxx@xxxxx   2002-01-24

======================================================================

N/A

When we do the infamous resize dance after correct insets are
computed, we check if the requested top-level size was set via pack().
If it was, then we take the interior size as the constraint and assume
that it was computed with incorrect insets.  So we resize the
top-level to adjust for corrected insets and to keep the interior size.

The way it was done is very simple-minded - we just set a flag in pack
and check that flag when we realize the peer.  The top-level is then
resized but the flag is not cleared.  So when he top-level is disposed
and realized again, the code thinks that the size of the top-level
(corrected upon first show()) was computed using incorrect insets and
re-resizes the top-level &c.  So on each show() the top-level size is
repeatedly adjusted by the difference between the insets guess
(usually wrong) and actual insets.

 xxxxx@xxxxx   2002-01-24

======================================================================