Merge branch 'content-editor-fix-layout-shifting' into 'master'

Content editor: Fix layout shifting

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/126861



Merged-by: Simon Knox <simon@gitlab.com>
Approved-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Approved-by: Simon Knox <simon@gitlab.com>
Co-authored-by: Sascha Eggenberger <seggenberger@gitlab.com>