Generate c# method when selecting a signal receiver

[GameScripting]

Describe the project you are working on

Playing arround with godot, working on mini games (dev time <10h)

Describe the problem or limitation you are having in your project

I am using godot with mono/c# as my main scripting language. The IDE I am using is Jetbrains Rider.
When creating a new signal (double click (1)) I select the target node (2), the method name is automatically generated (3) and I click "Connect" (4).

Now Jetbrains Rider opens the script of the receiver node and nothing more happens.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

I would like a feature that automatically adds the receiver method to my c# source code file.
Especially when working with signals that use a lot of parameters (for example the signals in the collision space have a lot of parameters) it is annoying to create the c# method by hand. It would be nice if the method could be auto-added to the c# file.
This feature already exists for gdscript.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

1. The editor should parse the c# source file
2. Generate the required code
3. Add it to the c# source file

It could also be implemented in a IDE specific way (for example in the Jetrbains Rider plugin), however a generic solution the is independed from the IDE used would provide more overall value. It could be used by anyone using c# with any IDE.

If this enhancement will not be used often, can it be worked around with a few lines of script?

The required method can be manually added to the c# source file, which is exactly what is required to do now.

Is there a reason why this should be core and not an add-on in the asset library?

The feature is already implemented in gdscript and would provide the same value for c# users. A generic solution that is independed from the IDE would provide more overall value. It could be used by anyone using c# with any IDE.

[GameScripting]

This is my first ever contribution / gh-issue on godot.

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I am willing to implement this feature by myself, however I have no practical experience with c++.

Is there any way to implement it in c#? In my optinion this feature is only required for the "mono edition" of godot, so mono would always be installed and useable. Using the [Tool] annotation it is already possible to run mono code within the editor (see https://docs.godotengine.org/en/stable/tutorials/plugins/editor/making_plugins.html)

What (which c++ file) would be a good starting point? Would it be possible to create this as a plugin?

[Calinou]

Duplicate of godotengine/godot#41283, which should be fixed by godotengine/godot#42416. (This is actually a bug.)