With FS1182 warnon, underscore code fixes insert two underscores

[psfinaki]

In particular, "prefix with underscore" and "replace with underscore".

underscores.mp4

[psfinaki]

This happens because the diagnostic is produced twice - by the analyzer and by the compiler. Hence the same code fix is applied twice. It's just luck this doesn't provide broken code and only looks weird.

[psfinaki]

Reopening to fix properly, see this discussion.