Issue Summary

Yes on Windows - Chrome web browser

Steps to Reproduce

1. Add a checklist to any card
2. Enter any text which is a few letters off taking up a whole line
3. Click @ and mention someone on the checklist line
4. @xxx is added and checklist goes over the 2nd line but doesn't expand (hiding the content).

Saving the line and going back to edit it works as expected and the input now expands to 2 lines.

Expected Results

The @ user name should be displayed rightly and the checklist line should expand 

Actual Results

Added the gif

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available