### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Linux Mint 20 (Ulyana) - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 SUPER (nvidia; 515.105.01) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

Dragging and dropping a file to a new position inside its current folder, or onto the icon for its current folder - when that folder is the project root folder :res// - will be treated as though you were dropping a different file with the same name.

Expectation: for nothing to happen.

Also tried it in 4.0.3 and 4.1-dev3, where it behaves as expected.

https://github.com/godotengine/godot/assets/64640811/90de1120-dd92-41b8-b202-db77c343103a

### Steps to reproduce

1. New or existing project.
2. Click and drag a file in :res// in FileSystem dock.
3. Drop the file back into :res//.
4. Be prompted to overwrite or rename.

### Minimal reproduction project

N/A
_set_file_display(file_list_display_mode != FILE_LIST_DISPLAY_LIST);
	emit_signal(SNAME("display_mode_changed"));
}
void FileSystemDock::_set_file_display(bool p_active) {
	if (p_active) {
		file_list_display_mode = FILE_LIST_DISPLAY_LIST;
		button_file_list_display_mode->set_icon(get_theme_icon(SNAME("FileThumbnail"), SNAME("EditorIcons")));
		button_file_list_display_mode->set_tooltip_text(TTR("View items as a grid of thumbnails."));
	} else {
		file_list_display_mode = FILE_LIST_DISPLAY_THUMBNAILS;
		button_file_list_display_mode->set_icon(get_theme_icon(SNAME("FileList"), SNAME("EditorIcons")));
		button_file_list_display_mode->set_tooltip_text(TTR("View items as a list."));
	}
	_update_file_list(true);
}
bool FileSystemDock::_is_file_type_disabled_by_feature_profile(const StringName &p_class) {
	Ref<EditorFeatureProfile> profile = EditorFeatureProfileManager::get_singleton()->get_current_profile();
	if (profile.is_null()) {
		return false;
	}
	StringName class_name = p_class;
	while (class_name != StringName()) {
		if (profile->is_class_disabled(class_name)) {
			return true;
		}
		class_name = ClassDB::get_parent_class(class_name);
	}
	return false;
}
void FileSystemDock::_search(EditorFileSystemDirectory *p_path, List<FileInfo> *matches, int p_max_items) {