[4.0] "Custom Effects" dropdown menu of RichTextLabel doesn't work

[Xartorx]

Godot version

v4.0.dev.custom_build [203cc6dd3]

System information

Windows 10, 1080 Ti

Issue description

Clicking on "Custom Effects" array item doesn't show (or show very briefly) dropdown menu for RichTextEffect.
Possibly this bug affects other dropdown menus for arrays, but didn't tested it yet.

out.mp4

Steps to reproduce

1. Add RichTextLabel
2. Change "Custom Effects" size to 1 (or more)
3. Click on [empty] dropdown menu

Minimal reproduction project

N/A

[requizm]

I couldn't find the function that works when I click dropdown. I messed around with:
-ArrayPropertyEdit
-EditorPropertyArrayObject
-EditorPropertyArray

[williamd67]

I think that this issue relates to #49817 which refers to #45879. The method get_effects of RichTextLabel returns a copy of the custom effects array (see below). This means that the editor determines that this value changes continuously, which can also be seen be the 'undo' symbol that is shown immediately and when clicked does not seem to do anything (see screenshot).

Vector<Variant> RichTextLabel::get_effects() {
	Vector<Variant> r;
	... 
	return r;
}

I will investigate further if the member can be returned in stead of a copy and what the impact of that would be.