Fix spacing when going between write and preview tabs in markdown header

Jarek Ostrowskirequested to merge
fix-write-preview-md-header-tab-spacing into master

Closes #343160 (closed).

What does this MR do and why?

Fixes the spacing issue when going between Write and Preview tabs in the markdown toolbar header.

Screenshots or screen recordings

Before After
md-header-before firefox-after

How to set up and validate locally

  1. Go to a markdown comment editor, click between Write and Preview tabs.
Edited by Jarek Ostrowski

Merge request reports