From that diff, I've selected some wikitext:
When I paste it in the 2017 wikitext editor, I have that:
☀<s><tvar|RC></s>Special:RecentChanges<s></></s>☂
Trizek-WMF | |
Dec 19 2016, 5:31 PM |
F5102999: Capture d’écran_2016-12-19_18-26-17.png | |
Dec 19 2016, 5:31 PM |
F5102995: Capture d’écran_2016-12-19_18-25-48.png | |
Dec 19 2016, 5:31 PM |
From that diff, I've selected some wikitext:
When I paste it in the 2017 wikitext editor, I have that:
☀<s><tvar|RC></s>Special:RecentChanges<s></></s>☂
The <s>'s would be correct as you pasting formatted text (although they don't seem to correspond to the selected text). The sun and umbrella were fixed in https://phabricator.wikimedia.org/T153247