mikelehen

    codeMirror.setOption('onDragEvent', function(cm, e) {
        // Move the cursor as they drag.
        var pos = codeMirror.coordsChar({left: e.x, top: e.y });
        codeMirror.setCursor(pos);
        codeMirror.focus();

        var isImageDrop = e.type == 'drop' && e.dataTransfer.files && e.dataTransfer.files.length > 0 && e.dataTransfer.files[0].type && e.dataTransfer.files[0].type.indexOf('image/') > -1;
        if (!isImageDrop) return;
        event.preventDefault();