Autocomplete methods from custom script for override

[KoBeWi]

Describe the project you are working on:
A game with lots of script inheritance going.

Describe the problem or limitation you are having in your project:
When you write func, you get a nice autocompletion list for virtual methods ready to be overriden. However these are only built-in methods. When inheriting a custom script, there's no list at all and there's no way to make the custom methods appear in the override list.

I have e.g. an Enemy class with lots of callbacks. Not only I have to remember them all, I have to write them perfectly, otherwise the override will have no effect. The meh workaround is copy-pasting them from my Enemy script.

Describe how this feature / enhancement will help you overcome this problem or limitation:
It would be immensely useful for productivity if we could have autocomplete for custom "virtual" methods, from inherited user script. It could suggest all methods or methods starting with _, any way would be useful.

Show a mock up screenshots/video or a flow diagram explaining how your proposal will work:

Describe implementation detail for your proposal (in code), if possible:
Just fill the func name autocompletion list with methods from inherited custom classes, not only built-in ones.

If this enhancement will not be used often, can it be worked around with a few lines of script?:
You can't write Script Editor plugins.

Is there a reason why this should be core and not an add-on in the asset library?:
You can't write Script Editor plugins. And even if you could, it's a rather obvious usability thing to have.

[hamoom]

I agree. I don't know why I dont get autocomplete from inherited scripts.

[Jummit]

Isn't this more of a bug report?

[KoBeWi]

No, this is just not implemented. Probably because there's no way to mark a method in GDScript as "virtual" (while it is possible with core methods). Either "virtual" methods should be implemented or we could just use the underscore convention.

[KoBeWi]

Now that GDScript has annotations, we could have an explicit @virtual annotation that makes a method show in autocompletion.

[KoBeWi]

Closing in favor of #5896