When I write an article to a newsgroup and edit the Newsgroup or Followup-To header, an selection list opens with suggested newsgroup names. The list should have the format: "<group-name> - <account>"
In TB78+ only the <account> is shown.

TB68 shows how it should look like.

Probably a regression of bug 440377 (tb-pills) ?

Wouldn't think pills is involved. Maybe this, but it does look correct: https://hg.mozilla.org/comm-central/diff/216cbe602979218a527744b2879387f1c98e6fe2/mailnews/news/src/NewsAutoCompleteSearch.jsm

Indeed this wasn't regressed by the pills as that implementation didn't affect the autocomplete.

This is the regression window.

This quick and dirty fix mitigates the regression. Maybe it would be more elegant to adapt the changed CSS code.

(In reply to Hartmut Welpmann [:welpy-cw] from comment #7)

This quick and dirty fix mitigates the regression.

-    return "subscribed-news";
+    return "subscribed-news-abook";

Yes that works. But I also think that is misleading.

(In reply to Hartmut Welpmann [:welpy-cw] from comment #7)

Maybe it would be more elegant to adapt the changed CSS code.

This one works as well.

But I must confess that I don't really know what I'm doing. A CSS expert should definitely take another look at this.

Pushed by alessandro@thunderbird.net:
https://hg.mozilla.org/comm-central/rev/aab067903744
Show group name in newsgroup autocomplete. r=mkmelin,aleca

Comment on attachment 9350115 [details]
Bug 1670457 - Show group name in newsgroup autocomplete. r=mkmelin

[Approval Request Comment]
Regression caused by (bug #): 1627200
User impact if declined: autocomplete of newsgroup header input not showing essential information
Risk to taking this patch (and alternatives if risky): low

Comment on attachment 9350115 [details]
Bug 1670457 - Show group name in newsgroup autocomplete. r=mkmelin

[Triage Comment]
Approved for beta (not yet on c-c, but has limited scope impact)