FIx for bug #2950799 up/down-arrow column stickiness confused by horiz scroll
FIx for bug #2950799 up/down-arrow column stickiness confused by horiz
scroll

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