`EditorPlugin._edit` is not called always when `EditorPlugin._handles` returns `true`

[AnidemDex]

Godot version

v4.2.beta5.official [4c96e96]

System information

Godot v4.2.beta5 - Manjaro Linux #1 SMP PREEMPT_DYNAMIC Sun Jul 16 16:48:53 UTC 2023 - Wayland - GLES3 (Compatibility) - Mesa Intel(R) UHD Graphics 600 (GLK 2) () - Intel(R) Celeron(R) N4020 CPU @ 1.10GHz (2 Threads)

Issue description

Accordding to EditorPlugin documentation, returning true on _handles will call _edit and _make_visible, which is partially true.

Editor will not call _edit for:

• Subresources inspected in a collection (EditorPlugin.edit is not called when EditorPlugin.handles() returns true for objects inside collections #56797)
• A resource inspected in another object property (this at least worked back before in Godot 3)

Even if _handles is true.

This is true for all Godot 4 versions (I'm working on Godot 4.0 and tested with all releases)

Steps to reproduce

1. Handle Resource
2. Print something on _edit callback
3. Create a node that export Resource variable
4. Enable plugin
5. Select the resource on the exported variable.

Minimal reproduction project

Just in case you can't download the project

extends Node
# Scene script

@export var resource:Resource

@export var array_of_resources:Array[Resource]

@tool
extends EditorPlugin
# Plugin Script

class FakeMainScreen extends PanelContainer:
	pass

var fake_screen := FakeMainScreen.new()
func _enter_tree() -> void:
	get_editor_interface().get_editor_main_screen().add_child(fake_screen)
	pass

func _handles(object: Object) -> bool:
	prints("Handles %s?"%object, object is Resource)
	return object is Resource

func _edit(object: Object) -> void:
	prints("Editing:", object)

func _make_visible(visible: bool) -> void:
	prints("Make main screen visible?", visible)
	if is_instance_valid(fake_screen): fake_screen.visible = visible

func _has_main_screen() -> bool: return true

func _get_plugin_name() -> String: return "FakeMainScreen"
func _get_plugin_icon() -> Texture2D:
	return get_editor_interface().get_base_control().get_theme_icon("Node", "EditorIcons")

func _exit_tree() -> void:
	fake_screen.queue_free()
	pass

editorplugin_bug.zip

[KoBeWi]

Seems like exported resources go through a different code path that ignores main screen plugins. Script field works differently.

[AnidemDex]

The solution for now is creating a custom property editor for the custom resource :/ (Godot 4.4 atm)