Function extend

mini-code-editor/cm/lib/codemirror.js:421–432

(e)

      setCursor(start.line, start.ch, true);

      function extend(e) {
        var cur = posFromMouse(e, true);
        if (cur && !posEq(cur, last)) {
          if (!focused) onFocus();
          last = cur;
          setSelectionUser(start, cur);
          updateInput = false;
          var visible = visibleLines();
          if (cur.line >= visible.to || cur.line < visible.from)
            going = setTimeout(operation(function(){extend(e);}), 150);
        }
      }

      function done(e) {
        clearTimeout(going);