copy-dir-locals-to-file-locals-prop-line command does nothing in LaTeX mode

Bug #1937311 reported by Bill Yikes
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
emacs (Ubuntu)
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Bug Description

When in latex-mode with a latex source file in the buffer, running:

  M-x copy-dir-locals-to-file-locals-prop-line

does nothing. It doesn't matter whether there is an existing line with -*- -*- or not.

It's a bit annoying, because there are 4 latex engines to choose from in the configuration menu, and it would be convenient to be able to make emacs choose the correct engine for the file at hand (because different files work with different engines).

Discovered on GNU Emacs 27.1

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