Fix for bug #2930488 Select All doesn't work if there's a rectangular selection.
Fix for bug #2930488 Select All doesn't work if there's a rectangular
selection.

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