Topic on Help talk:Paragraph-based Edit Conflict Interface

Fixed.

Please add rule .diffchange-inline { white-space: break-spaces; } because Google Chrome incorrect displays diffs with deleted trailing spaces, which tagged inside .diff-deletedline. See Diff Test in Google Chrome. ~~~~

Thanks for the report, Unfortunately this is unrelated to the two-column conflict-resolution interface. However, thanks to the super helpful example it was easy to create a patch, see gerrit:651181.

You accidentally left the old rule white-space: pre-wrap;.

That's called a fallback for browsers that don't understand the value further down. MediaWiki still needs to support Internet Explorer 11, that's why I did it like this.