Add property autocompletion for tween_property()

[KoBeWi]

Describe the project you are working on

Game in Godot.

Describe the problem or limitation you are having in your project

I use Tweens quite a bit, but I sometimes lack some more friendly way to tween properties. tween_property() does not come with autocompletion, so it's one of the very few things that you need to type manually.

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

tween_property() should provide autocompletion for property list, similar to e.g. method list when using old connect():

The list depends on the previous argument. It would appear here and list properties of the object in the first argument:

It would make it easier to pick properties to tween.

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

I think it would be implemented similarly to the aforementioned list of methods. I don't know if it's done via get_argument_options() or something different. I remember I tried to implement it myself a couple of times, but failed >_>

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

Kind of? If you have no autocompletion, the workaround is to just write it I guess.

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

Not sure if possible. Tween is core feature tho and it would benefit everyone that uses it.

[Mickeon]

This is unfortunately not possible with the current available methods, if not by making a special case for it. get_argument_options cannot infer the value of any previously inserted argument.