Reformat Code Ignores @formatter:off comment

[Phantom1472]

Even after enabling "Turn formatter on/off with markers in code comments" (path: File | Settings | Editor | Code Style)
the formatter ignores it and still formats lines that should not be changed.
For example:

// @formatter:off
let a =2

becomes:

// @formatter:off
let a = 2

[auduchinok]

Hi @Phantom1472, we use Fantomas library for formatting F# code, and with it's current design it has to be implemented there first to be available in Rider.

@nojaf What do you think about supporting such markers?

[nojaf]

Hello, this is being tracked in fsprojects/fantomas#1704.
I would like to have something in the likes of this supported.

I'm unfamiliar with the // @formatter:off syntax, so I can't say for sure we are going for this exact thing.
The scope of what is possible might be limited to start with but the request is accepted in principle.

[Phantom1472]

@nojaf This syntax comes from the default settings in Jetbrains tools:

As you can see, they also support a more general syntax (you can change these values)