DrawSelectionBlock
DrawSelectionBlock(which, fStart, fEnd);
DrawSelectionBlock(fFocus);
DrawSelectionBlock(fFocus, fStart, start - 1);
DrawSelectionBlock(fFocus, start, fStart - 1);
DrawSelectionBlock(fFocus, end + 1, fEnd);
DrawSelectionBlock(fFocus, fEnd + 1, end);
DrawSelectionBlock(fFocus);
DrawSelectionBlock(fFocus);
void DrawSelectionBlock(view_focus which,
void DrawSelectionBlock(view_focus which);