Fixed CPP lexer to work correctly when the '{' starting a fold section that is folded is deleted. This leads to the fold being unfolded which leads to reentrant styling which failed.
Fixed CPP lexer to work correctly when the '{' starting a fold section
that is folded is deleted. This leads to the fold being unfolded which
leads to reentrant styling which failed.

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