GDScript: auto completion bugs

[ThakeeNathees]

Godot version: v4.0.dev.custom_build 35ff38b

OS/device including version: windows 10

Issue description:

• no builtin types in type name (including "Variant") completion
  in both variable type completion and function return type completion there is no builtin type
  

• function argument suggestions are wrong (use with indexing)
  

• no argument hint immediately after open a bracket
  

• autocompletion of subclass suggest other subclasses too
  

Resolved issues

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1. no builtin types in type name (including "Variant") completion in both variable type completion and function return type completion there is no builtin type
2. function argument suggestions are wrong (use with indexing)
3. no argument hint immediately after open a bracket
4. autocompletion of subclass suggest other subclasses too

[gvekan]

When working on #42382, I found that the example in that issue does not get any autocompletion options in master.

I found that entries was empty which stops the creation of the completion suggestions, but I have not researched why there are no entries..

godot/editor/code_editor.cpp

Lines 835 to 837 in 3c441ba

	if (entries.size() == 0) {
	return;
	}

Hope it is okay that I comment this here, because it seems similar to the issues listed.

[HolonProduction]

Just tested in v4.1.stable.official [9704596].

• Problem 1 is fixed (no builtin types in type name (including "Variant") completion)

Problems 2 and 4 still apply.

[HolonProduction]

Can't reproduce the 4th problem on v4.2.dev.custom_build [ef155c1]