### 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
Vector<String> selected_strings;
	TreeItem *favorites_item = tree->get_root()->get_first_child();
	TreeItem *active_selected = tree->get_selected();
	if (active_selected && active_selected != favorites_item) {
		selected_strings.push_back(active_selected->get_metadata(0));
	}
	TreeItem *selected = tree->get_root();
	selected = tree->get_next_selected(selected);
	while (selected) {
		if (selected != active_selected && selected != favorites_item) {
			selected_strings.push_back(selected->get_metadata(0));
		}
		selected = tree->get_next_selected(selected);
	}
	if (remove_self_inclusion) {
		selected_strings = _remove_self_included_paths(selected_strings);
	}
	return selected_strings;
}
Vector<String> FileSystemDock::_remove_self_included_paths(Vector<String> selected_strings) {