Fix inverted Write/Preview tabs in single file editor

skkzshrequested to merge
gitlab-community/gitlab-org/gitlab:skkzsh/inverted-preview-tab into master

What does this MR do and why?

Fixes "Preview" tab closes the Markdown preview (and ... (#616108 - closed).

Screen recordings

Manually verified in GDK-in-a-box:

Change the file extension Context menu

Notes

  • I don't work on the frontend regularly — a careful look at this approach would be very helpful.

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