### Godot version

4.1.dev (dc625bcbfc5b587ba8867481ee7a1f6a567c25d0)

### System information

Mageia 9, Linux

### Issue description

When importing a project in current `master`, the following error is raised for each asset that gets imported:
```
Attempting to parent and popup a dialog that already has a parent.
```

It seems to be raised once per asset, caused by the progress dialog.

CC @bruvzg

### Steps to reproduce

- Import a new project in Godot that contains importable assets, e.g. https://github.com/RPicster/godot4-demo-desert-light

### Minimal reproduction project

See above.
p_list->push_back(PropertyInfo(Variant::COLOR, PNAME("theme_override_colors") + String("/") + E, PROPERTY_HINT_NONE, "", usage));
		}
	}
	{
		List<StringName> names;
		default_theme->get_constant_list(get_class_name(), &names);
		for (const StringName &E : names) {
			uint32_t usage = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_CHECKABLE;
			if (theme_constant_override.has(E)) {
				usage |= PROPERTY_USAGE_STORAGE | PROPERTY_USAGE_CHECKED;
			}
			p_list->push_back(PropertyInfo(Variant::INT, PNAME("theme_override_constants") + String("/") + E, PROPERTY_HINT_RANGE, "-16384,16384", usage));
		}
	}
	{
		List<StringName> names;
		default_theme->get_font_list(get_class_name(), &names);
		for (const StringName &E : names) {
			uint32_t usage = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_CHECKABLE;
			if (theme_font_override.has(E)) {
				usage |= PROPERTY_USAGE_STORAGE | PROPERTY_USAGE_CHECKED;
			}
			p_list->push_back(PropertyInfo(Variant::OBJECT, PNAME("theme_override_fonts") + String("/") + E, PROPERTY_HINT_RESOURCE_TYPE, "Font", usage));
		}
	}
	{
		List<StringName> names;
		default_theme->get_font_size_list(get_class_name(), &names);
		for (const StringName &E : names) {
			uint32_t usage = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_CHECKABLE;