The newsgroups are no more reorderable through DnD. In a German newsgroup it's reported after backout of bug 1334834 they are regroupable again.
Oops, killed one line too much :-( https://hg.mozilla.org/comm-central/rev/93d7402586ec#l39.98
Pushed by email@example.com: https://hg.mozilla.org/comm-central/rev/535d11b0e2cd Bug 1334834: Restored accidentally removed line, restores newgroup sort. r=me DONTBUILD
Status: NEW → RESOLVED
Last Resolved: 9 months ago
Resolution: --- → FIXED
9 months ago
Target Milestone: --- → Thunderbird 57.0
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