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Created attachment 12850 [details]
screenshot of 100% width TOC

Please have a look at https://commons.wikimedia.org/wiki/Help:Slideshow or https://commons.wikimedia.org/wiki/MediaWiki_talk:WatchlistNotice or https://commons.wikimedia.org/wiki/Help:Watchlist_messages

The TOC has now always 100% width. It was size-to-fit before. I think the 100% looks a bit odd.

This does not happen when using debug=true -- so it might be a local issue.

The following CSS file seems to be broken:
https://bits.wikimedia.org/commons.wikimedia.org/load.php?debug=false&lang=en&modules=ext.gadget.AjaxQuickDelete%2CExtraTabs2%2CGlobalUsageUI%2CGoogleImages%2CHidePostEdit%2CLanguageSelect%2CQuickDelete%2CRTRC%2CRotateLink%2CSlideshow%2CSum-it-up%2CTineye%2CUserMessages%2CWatchlistNotice%2CWikiMiniAtlas%2Cpopups%2Csearch-new-tab|ext.rtlcite%2Cwikihiero|ext.uls.nojs|mediawiki.legacy.commonPrint%2Cshared|mediawiki.special|mw.PopUpMediaTransform|skins.vector&only=styles&skin=vector&*

I am just looking where it is.

Purging my browser's cache now solved the issue.