The page jumps erratically as the last line of text is entered

[1-2-3]

Description

When the content is more than one page, the page will jump when the text is typed in the last line. See the picture below for the effect:

https://i.loli.net/2020/03/01/f4mXBpTKxtCGUFr.gif

• Can you reproduce the issue?

Steps to reproduce

1. Open a document that is more than one page long
2. Type text continuously on the last line，the page jumps irregularly
3. That's not going to happen if you add a few blank lines at the bottom so that the text is not entered in the last line.

Expected behavior: The page also stays stable while the last line of text is entered

Actual behavior: The page jumps erratically as the last line of text is entered

Link to an example: [optional] https://i.loli.net/2020/03/01/f4mXBpTKxtCGUFr.gif

Versions

• Mark Text: 0.16.0.rc-3
• Operating system: Win10 19037.1