### 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
_navigate_to_path(p_file);
}
void FileSystemDock::_file_multi_selected(int p_index, bool p_selected) {
	
	int current = files->get_current();
	if (current == p_index) {
		String fpath = files->get_item_metadata(current);
		if (!fpath.ends_with("/")) {
			current_path = fpath;
			if (display_mode == DISPLAY_MODE_SPLIT) {
				_update_tree(get_uncollapsed_paths());
			}
		}
	}
	
	import_dock_needs_update = true;
	call_deferred(SNAME("_update_import_dock"));
}
void FileSystemDock::_tree_mouse_exited() {