Some macros display a border artifact on the new editor

Issue Summary

Environment

• New editor
• 3rd party macros, for example latex math does this, also some native ones do this occasionally

  Steps to Reproduce

1. Insert a macro, for example latex math
2. There is a grey border artifact on the right side of the macro

Expected Results

No grey border

Actual Results

There is a grey border

Workaround

No workaround. Sometimes resizing the page may remove this.