Full Rect MarginContainer does not work fine in the main scene plugin

[DexterFstone]

Tested versions

reproducible in 4.2.1.stable

System information

Windows 7, 10, Godot 4.2.1 Stable

Issue description

I tried to make a main scene plugin I put a margin container and made it fully rect but in plugin did not work at all
My scene:

result:

after that, I added some code to my scene script and now it's better
Code:

@tool
extends Control

@onready var data_container = $DataContainer
@onready var h = data_container.size.y

func _ready():
	await get_tree().create_timer(5).timeout
	data_container.position.y = 0
	data_container.size.y = h

result:

but why? Is it a bug or do I miss something?

Steps to reproduce

1. create a main scene plugin

2. add the margin container as a child as the control node and make it a full Rect

3. add a label or anything to show content

4. Test result
   or

5. test attached addon

Minimal reproduction project (MRP)

addons.zip

[KoBeWi]

The MainScreen Control where you add your plugin is a VBoxContainer.

You need to set vertical size flags to Fill + Expand to make your node use full size.

I see get_editor_main_screen() already returns a VBoxContainer, but maybe it could use an additional clarification somewhere 🤔

[DexterFstone]

The MainScreen Control where you add your plugin is a VBoxContainer. You need to set vertical size flags to Fill + Expand to make your node use full size.

I see get_editor_main_screen() already returns a VBoxContainer, but maybe it could use an additional clarification somewhere 🤔

My Tree:

Everything is expanded and fill

[DexterFstone]

I changed the type of marginContainer to Control node in problem is fix soo margin container has a problem and it is a bug

[KoBeWi]

You did not fix your problem, but you hid it. The Control has wrong size.

[DexterFstone]

The Control has wrong size.

which one?

[KoBeWi]

The one you used instead of MarginContainer. You can see the content correctly, because non-Container nodes don't arrange their children.

[DexterFstone]

The one you used instead of MarginContainer. You can see the content correctly, because non-Container nodes don't arrange their children.

I changed again to margin container
I want to know fix the problem
Can u edit my attached file and send it again?

[KoBeWi]

Instead of anchors, use the container sizing menu and set it to vertical fill with expand flag:

You need to set it in your root node, it will make it take the full available space.

[DexterFstone]

Instead of anchors, use the container sizing menu and set it to vertical fill with expand flag: You need to set it in your root node, it will make it take the full available space.

nothing happened

[KoBeWi]

addons.zip

[DexterFstone]

addons.zip

Do u just check Expand? why is your file working but when I do that is not work?

[KoBeWi]

Enable Expand and then click Fill.

[DexterFstone]

Enable Expand and then click Fill.

[KoBeWi]

Did you set it for the root node? (Control)
Also when you change it, be sure to reload the plugin.

I used the toolbar menu when setting it, but it should be the same using the inspector.

[DexterFstone]

Did you set it for the root node? (Control) Also when you change it, be sure to reload the plugin.

I used the toolbar menu when setting it, but it should be the same using the inspector.

yes I do
one more thing I tested, I created a new scene and it worked fine so it is a bug but rare