### 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
String to_dir;
		bool favorite;
		_get_drag_target_folder(to_dir, favorite, p_point, p_from);
		return !favorite && Array(drag_data["nodes"]).size() == 1;
	}
	return false;
}
void FileSystemDock::drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) {
	if (!can_drop_data_fw(p_point, p_data, p_from)) {
		return;
	}
	Dictionary drag_data = p_data;
	Vector<String> dirs = EditorSettings::get_singleton()->get_favorites();
	if (drag_data.has("favorite")) {
		if (String(drag_data["favorite"]) != "all") {
			return;
		}
		
		TreeItem *ti = tree->get_item_at_position(p_point);
		if (!ti) {
			return;
		}
		int drop_section = tree->get_drop_section_at_position(p_point);
		int drop_position;
		Vector<String> drag_files = drag_data["files"];
		TreeItem *favorites_item = tree->get_root()->get_first_child();
		TreeItem *resources_item = favorites_item->get_next();
		if (ti == favorites_item) {