Resizing table column inside RichText editor randomly fails with selecting elements below RichText area.
You can see an example of this bug in the attached gif.

Steps to reproduce:
1. Start creating a new article.
2. Create new table inside RichText area with multiple rows and columns (in Intro for example).
3. Try to change any column width for a couple of times.

Result
Instead of column width change some elements below RichText area gets selected.

Bug can be encountered in newest Firefox, Chrome and Edge browsers.