Fix off-by-one error in PlainEditor::cursor_at
#187
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I believe the cursor should still land at index `self.buffer.len()` (logically following the last cluster). E.g., in linebender/xilem#762, if used without this change, the selection can't span the last cluster using `cursor_at`.
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I believe the cursor should still land at index
self.buffer.len()(logically following the last cluster).E.g., in linebender/xilem#762, if used without this change, the selection can't span the last cluster using
cursor_at.