Avoid extra processing if SETHSCROLLBAR used to set to same value as before.
Avoid extra processing if SETHSCROLLBAR used to set to same value as
before.

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