Godot-proposals: Implement script editor description hint on hover a symbol/word

[ThakeeNathees]

Describe the project you are working on:
Description hint on hover for the text edit(https://github.com/ThakeeNathees/godot/tree/TextEdit-hover-hint)

Describe the problem or limitation you are having in your project:
it's one of the essential feature for a fully featured script editor and currently we lack of. Also the implementation of GDScript doc comments (https://github.com/godotengine/godot/pull/41095) it'll improve the user experience.

Describe the feature / enhancement and how it helps to overcome the problem or limitation:
when a symbol is hovered by the mouse, the text editor emits a signal to validate the symbol (like when it's being hovered with a ctrl), and when validating for that symbol it'll add some additional data (like description, type, class_name, return_type, arguments, etc.,) and display them at the text edit's draw call.

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
A working example (this will work with doc comments when it'll be merged)

If this enhancement will not be used often, can it be worked around with a few lines of script?:
No, It would be a great usability improvement and can't be worked around with the script.

Is there a reason why this should be core and not an add-on in the asset library?:
there is no way to implement this with an add-on

[echebbi]

I'm glad to see that someone is finally working on this, thanks very much for the work!

Would it also be possible associate the "show hint" action to a keyboard shortcut (i.e. show the hint corresponding to the symbol at the cursor's location)? I mainly use the keyboard when coding and having to take the mouse each time I want to check the documentation would be inconvient.

[me2beats]

Providing API for (optional) having this for custom classes and methods could be useful as well

[Calinou]

@me2beats This will probably be done automatically by https://github.com/godotengine/godot/pull/41095.

[ThakeeNathees]

@me2beats yeah it's possible with godotengine/godot#41095 tested locally.
I've exams next month, I'll improve it and implement color themes when it's done :)