Steps to replicate the issue (include links if applicable):
- open a random article, for exemple this one
- activate the full width using the toggle located on the bottom right of the screen, or unchecking the "Enable limited width mode" mode [[Special:Preferences#mw-prefsection-rendering|in your Preferences]]
- click on "Edit source"
- then click on the button "Show preview"
What happens?:
- after a fraction of second at full width, the preview shows the width of the content limited.
What should have happened instead?:
- preview should retain the choice done by the user via the limited width toggle.
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
Originally reported here on English Wikipedia
