### Godot version

v4.1.stable.official [970459615]  < Steam

### System information

Godot v4.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Mobile) - dedicated NVIDIA GeForce GTX 1060 (nvidia) - Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz (6 Threads)

### Issue description

After Godot got upgraded 4.0 -> 4.1, when opening a project from the earlier version, I noticed that the buttons in the confirmation dialog look a bit squiffy:

![Screenshot_20230706_123457](https://github.com/godotengine/godot/assets/441188/eb5dc8e3-9941-4cac-8cb8-17167d1f33bf)

(Somewhat aside, but that dialog should probably be able to deduce and be more precise about whether it's an upgrade or downgrade!)

### Steps to reproduce

1. Have a project from Godot 4.0
2. Upgrade Godot to 4.1
3. Open project manager

Alternatively:
1. Create a new project in 4.1
2. Quit Godot
3. Edit the `project.godot`'s `config/features` to read `4.0` instead of `4.1`
4. Open project manager

### Minimal reproduction project

[default.zip](https://github.com/godotengine/godot/files/11967512/default.zip)

continue;
		}
		
		
		if (c == buttons_hbox || c == bg_panel || c->is_set_as_top_level()) {
			continue;
		}
		Size2 child_minsize = c->get_combined_minimum_size();
		content_minsize.x = MAX(child_minsize.x, content_minsize.x);
		content_minsize.y = MAX(child_minsize.y, content_minsize.y);
	}
	
	
	if (theme_cache.panel_style.is_valid()) {
		content_minsize += theme_cache.panel_style->get_minimum_size();
	}
	
	
	Size2 buttons_minsize = buttons_hbox->get_combined_minimum_size();
	content_minsize.x = MAX(buttons_minsize.x, content_minsize.x);
	content_minsize.y += buttons_minsize.y;
	
	content_minsize.y += theme_cache.buttons_separation;
	return content_minsize;
}
void AcceptDialog::_custom_action(const String &p_action) {
	emit_signal(SNAME("custom_action"), p_action);
	custom_action(p_action);
}
Button *AcceptDialog::add_button(const String &p_text, bool p_right, const String &p_action) {