### 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
node->set_name("Node");
		scene->pack(node);
		memdelete(node);
	}
	EditorNode::get_singleton()->push_item(r);
	EditorNode::get_singleton()->save_resource_as(Ref<Resource>(r), fpath);
}
void FileSystemDock::_search_changed(const String &p_text, const Control *p_from) {
	if (searched_string.length() == 0) {
		
		uncollapsed_paths_before_search = get_uncollapsed_paths();
	}
	searched_string = p_text.to_lower();
	if (p_from == tree_search_box) {
		file_list_search_box->set_text(searched_string);
	} else { 
		tree_search_box->set_text(searched_string);
	}
	bool unfold_path = (p_text.is_empty() && !current_path.is_empty());
	switch (display_mode) {
		case DISPLAY_MODE_TREE_ONLY: {
			_update_tree(searched_string.length() == 0 ? uncollapsed_paths_before_search : Vector<String>(), false, false, unfold_path);
		} break;
		case DISPLAY_MODE_SPLIT: {
			_update_file_list(false);
			_update_tree(searched_string.length() == 0 ? uncollapsed_paths_before_search : Vector<String>(), false, false, unfold_path);
		} break;
	}
}
void FileSystemDock::_rescan() {