Nitpick mode today. Another small fix.

 From the preamble:

As of 2.8a2096 (non-flagship),
the subpane allocation for MessageCategoryBrowsers is
slightly and subtly broken. This results in overlapping
subMorphs, and the pane splitter is not draggable.

I tried to grok the original intention in
Browser>>openAsMorphMsgCatEditing:
and replaced #extent: by #corner: in one place.

Cheers,
Helge
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