Function extend

external/.scrollLibs.js:10280–10315

(e)

    var counter = 0

    function extend(e) {
      var curCount = ++counter
      var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle")
      if (!cur) {
        return
      }
      if (cmp(cur, lastPos) != 0) {
        cm.curOp.focus = activeElt()
        extendTo(cur)
        var visible = visibleLines(display, doc)
        if (cur.line >= visible.to || cur.line < visible.from) {
          setTimeout(
            operation(cm, function () {
              if (counter == curCount) {
                extend(e)
              }
            }),
            150
          )
        }
      } else {
        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0
        if (outside) {
          setTimeout(
            operation(cm, function () {
              if (counter != curCount) {
                return
              }
              display.scroller.scrollTop += outside
              extend(e)
            }),
            50
          )
        }
      }
    }

    function done(e) {
      cm.state.selectingText = false