FullScreen CodeView unscrollable when using suneditor option "height: 'auto'"

[SystemChanger]

Describe the bug
When using codeView in fullScreen mode and suneditor created with height: 'auto' in SunEditorOptions object scrollbar is totally broken and content can't be scrolled.

To Reproduce
Steps to reproduce the behavior:

1. Go to http://suneditor.com/sample/html/examples.html#groups
2. Scroll down to 'Char count, Button groups, toolbar container' sub-title (#anchor to it added in url above)
3. Click 'Full screen' button
4. Add lines to text-area so the vertical scrollbar appear
5. Click 'Code view' button
6. See the totally broken and unusable vertical scrollbar.

Expected behavior
Totally serviceable and usable vertical scrollbar and scrolling :)

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• Browser: chrome
• Version: latest

Additional context
It looks like the problem is in this line:
https://github.com/JiHong88/SunEditor/blob/00b9eff22be0f7385e8588218230c79b2d4c0df1/src/lib/core.js#L4277

It sets the text-area element height to be higher than the parent's.
Looks like we should use some other height there. Why can't we just not change it and leave it at "100%"?

Possible solutions

1. Use the appropriate height (where can we get it?)
2. Provide the correct value in context.element.code.scrollHeight (where can we get it?)
3. Do we really need this line? (lol)
4. Add !fullscreen condition.
   I tested this way, and it works for this issue, but I am not sure if this is the correct solution in general, so without pull-request right now.

 if (options.height === 'auto' && !options.codeMirrorEditor && !this._variable.isFullScreen) context.element.code.style.height = context.element.code.scrollHeight > 0 ? (context.element.code.scrollHeight + 'px') : 'auto';

P.S. this line is too complicated.

Maybe you should also check other places that use this height.

[mvoorberg]

This issue applies to more than just the full-screen code view. The textarea containing the code view has overflow-hidden style applied to it directly. Removing overflow hidden corrects the behaviour.

Add the following to your page CSS

// Sidestep a bug in the editor code view, where it has no scrollbars!
.sun-editor .se-wrapper .se-wrapper-code {  
  overflow: auto !important;
}

[JiHong88]

The 2.42.0 version has been updated.
If this issue has not been resolved, please reopen this issue.
Thank you.