There is a problem with the text selection function

[RonghuaHe]

What happened?

As described in the picture

What are the steps to reproduce?

1. When the animation cursor is in the front position, hold down the shift key and click on the end of the line. This range cannot be selected
2. There is no mouse action, such as using the mouse to click somewhere and then swipe to select the text at the swipe
3. Cannot drag to expand the selection

What is the expected behavior?

Text selection can be as powerful as UITextView or NSTextView