When selection is rectangular do not collapse it to a single selection when performing a deletion, only when adding characters.
When selection is rectangular do not collapse it to a single selection when
performing a deletion, only when adding characters.

R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone