I was wondering why I was only seeing performance-move-const-arg fixes apply in some files but not others, so I dug a little deeper and found some instances of the warning suggesting a fix while other source files do not:
warning: std::move of the variable 'message' of the trivially-copyable type 'T' has no effect; remove std::move() [performance-move-const-arg]
and in the other file:
warning: std::move of the variable 'request' of the trivially-copyable type 'T' has no effect [performance-move-const-arg]
If I understand correctly, it has to do with trivially copyable variables. For instance an int does the same when moved and copied. Hence the warning, though, as the function signature required an revalue, it does not remove the std::move.
Personal opinion: this warning in this situation is giving at the wrong location and should be given on the function definition. Such that it is obvious that one should remove the && on it and the declaration. It could give a fixit for that instead. If you cannot update that code, reporting about it makes no sense.