As you know, if you put a long text in CT_EDIT (RscEdit) with ST_LEFT and move the caret to the right so that it falls outside the control size, the "view" changes to show the caret.
But now if you try a backward selection (hold click and drag to the left) to go back to the beginning of the text, the view doesn't change and the caret doesn't move any further backwards than the current view.