miruka c00e35a948 Don't change chat width when showing overlay panes
When auto-expanding a pane and showing it as an overlay because of
narrow window, make the chat keep the width it had before.

This makes the transition less jarring, reduces the amount of text seen
through a transparent pane, and fix making one pane overlay expanding
the other.
2020-07-14 16:16:48 -04:00
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