docs: @Override
      public void mouseReleased(MouseEvent e) {
          if (e.getComponent() == this
                  && (e.getModifiers() & MouseEvent.BUTTON1_MASK) != 0) {
              int y = e.getY();
              Font font = fileWindow.textArea.getFont();
              FontMetrics metrics = getFontMetrics(font);
              int h = metrics.getHeight();
              int line = y/h;
              if (line == pressLine) {
                  fileWindow.toggleBreakPoint(line + 1);
              } else {
                  pressLine = -1;
              }
          }
      }