codemirrorのlint error/warningをモバイルでも表示する ref: https://qiita.com/wicket/items/709c9be0e73b868d85c2

file0.txt

  CodeMirror.on(cm.display.scroller, "touchend", function (e) {
    let touch = cm.display.activeTouch;
    let date = new Date;
    if (touch &&  touch.left != null &&
        !touch.moved && date - touch.start < 300) {

      //エディタの何処かをsingle tapした
      if (!touch.prev) {

        //行に変換するならこれ
        var pos = cm.coordsChar(touch, "page");

        //gutterの範囲判定
        if(touch.left < Math.floor(cm.display.gutters.getBoundingClientRect().right)){
          showLintTooltip(pos.line);
          return;
        }
      }
    }

    //hide tooltip
    if(currentTooptipTarget) {
      dispatchMouseEvent(currentTooptipTarget, "mouseout", 0, 0);
      currentTooptipTarget = null;
    }
  });


  let currentTooptipTarget = null ;
  function showLintTooltip(line){

    let markers = jsEditor.state.lint.marked;
    let info = jsEditor.lineInfo(line);
    for (let marker of markers) {
      if (marker.lines[0].lineNo() === line) {
        //need to tooltip
        let element = info.gutterMarkers["CodeMirror-lint-markers"];
        if (element) {
          let rect = element.getBoundingClientRect();
          console.log(rect);

          if(currentTooptipTarget == element){
            //hide tooltip
            dispatchMouseEvent(element, "mouseout", rect.x, rect.y);
            currentTooptipTarget = null;
          }else {
            //hide tooltip
            if(currentTooptipTarget) {
              dispatchMouseEvent(currentTooptipTarget, "mouseout", rect.x, rect.y);
            }
            //show tooltip
            dispatchMouseEvent(element, "mouseover", rect.left+rect.width/2, rect.top+rect.height/2);

            currentTooptipTarget = element;
          }
          return;
        }
      }
    }
  }

  function dispatchMouseEvent(elm, type,x,y){

    var mouseMoveEvent = document.createEvent("MouseEvents");

    mouseMoveEvent.initMouseEvent(
        type, //event type : click, mousedown, mouseup, mouseover, mousemove, mouseout.
        true, //canBubble
        false, //cancelable
        window, //event's AbstractView : should be window
        1, // detail : Event's mouse click count
        x, // screenX
        y, // screenY
        x, // clientX
        y, // clientY
        false, // ctrlKey
        false, // altKey
        false, // shiftKey
        false, // metaKey
        0, // button : 0 = click, 1 = middle button, 2 = right button
        null // relatedTarget : Only used with some event types (e.g. mouseover and mouseout). In other cases, pass null.
    );

    elm.dispatchEvent(mouseMoveEvent);
  }