Swing hit-tests a tree row only as far as its label, so a click past the
end of the name did nothing. Rows are now found by their vertical band
alone, which covers selection, the context menus, double-click join and
middle-click info; the expand handle to the left of a label still works
the row without selecting it.
The hovered row is outlined across that same full width, so what a click
would act on is visible before making it. Spacers, which nothing can be
done with, are skipped, and the outline gives way to the drag-and-drop
indicator while a drag is in progress.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ericek111
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