如何避免Rappid中的TextEditor行颠簸

Question

I am working on JointJS/Rappid. In Rappid QAD Example,I try to edit the wrapped text on double tap the content.

1. Problem 1:

If large sentence text breaked for exact container, then try to edit the content half of the sentence only is there balance text disappear.

2. Problem 2:

If edit the content move the cursor can't properly move to the next place or try to click double space cursor move to top of the text

Example text for question :Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged

this.on('change:question', function () {
var wraptext = joint.util.breakText(this.get('question'), {
    width: 200,
    height: 70
});
 this.attr('.question-text/text', wraptext || '');                
}, this)

;