procedure TCustomSynEdit.RecalcCharsAndLinesInWin(CheckCaret: Boolean);
[..]
FWrappedLinesView.CharsInWindow:= CharsInWindow;
[..]
//This line becomes
if eoREdgeWrap in options2 then
FWrappedLinesView.CharsInWindow:= RightEdge
else FWrappedLinesView.CharsInWindow:= CharsInWindow;