PO template automatic generation ignores call chaining

[Destructor17]

Godot version

v4.1.beta2.official [a2575cb]

System information

Godot v4.1.beta2 - Ubuntu 22.04.2 LTS 22.04 - Vulkan (Mobile) - integrated AMD Radeon Vega 8 Graphics (RADV RAVEN) () - AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx (8 Threads)

Issue description

POT Generation ignores call chaining expressions. #77538 particularly covers this issue.

The workaround i used is to recurse thous expressions in GDScriptEditorTranslationParserPlugin::_assess_expression:

• CallNode::callee in case of GDScriptParser::Node::CALL
• SubscriptNode::base in case of GDScriptParser::Node::SUBSCRIPT. This case is currently not covered at all.

It would be also nice not to ignore anything in GDScriptEditorTranslationParserPlugin::_assess_expression to make POT Generation work in more general cases.

Steps to reproduce

Example code:

extends Node

class LabelManupulator:
	var _label: Label

	func _init(p_label: Label):
		_label = p_label

	func make_red() -> LabelManupulator:
		_label.modulate = Color(1, 0, 0, 1)
		return self

func _ready():
	add_label(tr("This message extracts correctly"))
	add_label(tr("This message is ignored")).make_red()

func add_label(p_text: String) -> LabelManupulator:
	var new_node = Label.new()
	new_node.text = p_text
	add_child(new_node)
	return LabelManupulator.new(new_node)

Reproduction steps:

1. Save example code as .gd file in any project
2. Open "Project settings", "Localization", sub-tab "POT Generation"
3. Click "Add" and add that .gd file
4. Click "Generate POT", choose a filename and save
5. Check which strings were included in .pot file

Minimal reproduction project

N/A

[olivergs]

The same happens if you use "await" in front of any call

somefunction(tr("This message extracts correctly"))
await somefunction(tr("This message is ignored"))