Steps to replicate the issue (include links if applicable):
What happens?:
The section title is parsed incorrectly as there is an extra double dot.
Reference
This probably also happens for Files and all the namespaces that require an initial : to create a wikilink.
I tested this and I can reproduce the problem: https://cs.wikipedia.org/w/index.php?title=Wikipedie:Pot%C5%99ebuji_pomoc&diff=prev&oldid=23585910.
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Change #1187974 had a related patch set uploaded (by Harsh_Kushwaha07; author: Harsh_Kushwaha07):
[mediawiki/extensions/GrowthExperiments@master] growthxperiments(helppanel): Fix double colon in section titles for category/file questions
Change #1187974 merged by jenkins-bot:
[mediawiki/extensions/GrowthExperiments@master] growthxperiments(helppanel): Fix double colon in section titles for category/file questions
Test wiki created on Patch demo by DMburugu (WMF) using patch(es) linked to this task:
https://b487e33925.catalyst.wmcloud.org/w/
Test wiki on Patch demo by DMburugu (WMF) using patch(es) linked to this task was deleted: