[Bug-kawa] [bug #33285] IllegalArgumentException after deleting to the beginning of the buffer

[Per Bothner]

Update of bug #33285 (project kawa):

                  Status:                    None => Confirmed              

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Follow-up Comment #1:

Oops. An embarrassing bug.  But as you suspect, it's not the right fix.  It
would be much appreciated if you could figure out what the problem is.

I'm guessing the issue is related to "Position" objects (implemented by
SwingContent.GapPosition) getting confused: some off-by-one error, or the
isAfter property is as it should be.  There may also be some confusion about
"empty" buffer not being quite empty - it should still has a single newline.
The CharBuffer#dump method can be useful for debugging.

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