Add property context menu to Inspector

[timothyqiu]

Describe the project you are working on

A game that uses AnimationTree.

Describe the problem or limitation you are having in your project

If you want to set parameter of some AnimationTree parameters, one have to write:

$AnimationTree.set("parameters/Seek/seek_position", 12.0)

The property path is quite long and no auto-complete available. But it's there in the property's tooltip :(

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

Add a context menu for properties in the Inspector. Put options like "Copy Value", "Copy Path", and "Open in Help" in it.

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

Right-clicking a property pops up a context menu like this:

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

Possible, but not a few lines I think.

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

It's a bit strange to download a plugin to solve the UX problem.

[AaronRecord]

See also #1504.

[YuriSizov]

I see no harm and should be easy to implement. Feel free to open a PR, I think.

For your problem though a drag'n'drop support would be even more useful, IMO. As in, dragging from the property label onto a script should insert the property path.

[KoBeWi]

Partially implemented by godotengine/godot#39404. We have a context menu now with copy/pase, but it needs an Open In Help option to close this proposal I guess.

[fire-forge]

I opened a PR to add an "Open Documentation" button, so the only part of this proposal left is the "Reset to Default" button. I didn't add it to the PR because don't see much of a use for it, but someone else can open a PR for that if they want to. But if the reset button isn't really needed, then this proposal can be closed after the PR is merged.