In error list lexer, detect lines that start with "+++ " as diff messages rather than additions.
In error list lexer, detect lines that start with "+++ " as diff messages
rather than additions.

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