[Update to 4.3.1] Switching visual -> text editor: changes are not saved

Hi,

I think there are 2 bugs when used with WordPress 4.3.1.

Steps to reproduce it (I also disabled all other plugins):
1. Open “edit post”
2. Change a few lines in the visual editor
3. Switch to Text mode
4. Switch to Visual mode

In step 3 you see that the changes you made in the visual editor are not in the text editor -> bug 1

Gif of the bug: https://i.imgur.com/zTg71J3.gifv

When you wait for a few mins in the step 4 you get an javascript error: hesh.min.js:1 Uncaught TypeError: Cannot read property ‘clientHeight’ of null

This is causing a lot of problems because when I change something in Visual mode and switch to the Text editor all my changes made in the Visual editor are lost.

Please fix this. I can give you access to my test-site if you can’t reproduce it yourself.

For now I disabled the plugin. Too bad, because this plugin WAS useful…

Cheers!

https://www.ads-software.com/plugins/html-editor-syntax-highlighter/