void pairDraw(GC gc, StyledRegion sr, int start, int end) {
   if (start > text.getCharCount() || end > text.getCharCount()) return;
   if (gc != null) {
     Point left = text.getLocationAtOffset(start);
     Point right = text.getLocationAtOffset(end);
     if (sr != null) {
       if (highlightStyle == HLS_XOR) {
         int resultColor = sr.fore ^ cm.getColor(text.getBackground());
         if (text.getLineAtOffset(text.getCaretOffset()) == text.getLineAtOffset(start)
             && horzCross
             && horzCrossColor != null
             && ((StyledRegion) horzCrossColor).bback)
           resultColor = sr.fore ^ ((StyledRegion) horzCrossColor).back;
         Color color = cm.getColor(sr.bfore, resultColor);
         gc.setBackground(color);
         gc.setXORMode(true);
         gc.fillRectangle(left.x, left.y, right.x - left.x, gc.getFontMetrics().getHeight());
       } else if (highlightStyle == HLS_OUTLINE) {
         Color color = cm.getColor(sr.bfore, sr.fore);
         gc.setForeground(color);
         gc.drawRectangle(
             left.x, left.y, right.x - left.x - 1, gc.getFontMetrics().getHeight() - 1);
       } else if (highlightStyle == HLS_OUTLINE2) {
         Color color = cm.getColor(sr.bfore, sr.fore);
         gc.setForeground(color);
         gc.setLineWidth(2);
         gc.drawRectangle(
             left.x + 1, left.y + 1, right.x - left.x - 2, gc.getFontMetrics().getHeight() - 2);
       }
     }
   } else {
     text.redrawRange(start, end - start, true);
   }
 }
 void drawLine(int lno) {
   if (lno < 0 || lno >= text.getLineCount()) return;
   int y = text.getLocationAtOffset(text.getOffsetAtLine(lno)).y;
   int height = 0;
   if (text.getLineCount() > lno + 1)
     height = text.getLocationAtOffset(text.getOffsetAtLine(lno + 1)).y - y;
   else height = text.getLocationAtOffset(text.getCharCount()).y + text.getLineHeight();
   int width = text.getClientArea().width + text.getHorizontalPixel();
   text.redraw(0, y, width, height, false);
 }
 void redrawFrom(int lno) {
   if (lno < 0 || lno >= text.getLineCount()) return;
   int y = text.getLocationAtOffset(text.getOffsetAtLine(lno)).y;
   int height = text.getClientArea().height - y;
   int width = text.getClientArea().width + text.getHorizontalPixel();
   text.redraw(0, y, width, height, false);
 }