Steps to reproduce the issue

1. Visit the Administrator Panel
2. From the sidebar, navigate to Content -> Articles
3. Open one Article in Edit mode
4. Resize the browser's width such that it crosses the 935px mark

Expected result

Nothing should happen to the text box.

Actual result

System information (as much as possible)

Google Chrome on Windows 10
Native Screen Resolution: 1920 x 1080
Screen Size: 15.6 inch

Additional comments

This isn't a major issue and refreshing the page fixes it.
Toggling the editor displays the HTML stringify-ed code but reverting back to the preview mode doesn't fix it.
A somewhat related issue was reported in #24547 and was closed.
Chrome console shows no errors/warnings