### 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
if (p_path == "Favorites") {
		
		return nullptr;
	}
	if (DirAccess::exists(p_path)) {
		
		return nullptr;
	}
	const String type = ResourceLoader::get_resource_type(p_path);
	Control *tooltip = EditorResourceTooltipPlugin::make_default_tooltip(p_path);
	for (const Ref<EditorResourceTooltipPlugin> &plugin : tooltip_plugins) {
		if (plugin->handles(type)) {
			tooltip = plugin->make_tooltip_for_path(p_path, EditorResourcePreview::get_singleton()->get_preview_metadata(p_path), tooltip);
		}
	}
	return tooltip;
}
Variant FileSystemDock::get_drag_data_fw(const Point2 &p_point, Control *p_from) {
	bool all_favorites = true;
	bool all_not_favorites = true;
	Vector<String> paths;
	if (p_from == tree) {
		
		TreeItem *selected = tree->get_next_selected(tree->get_root());
		while (selected) {
			TreeItem *favorites_item = tree->get_root()->get_first_child();
			if (selected == favorites_item) {
				
				return Variant();