### 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
return p_a.modified_time > p_b.modified_time;
	}
};
void FileSystemDock::_sort_file_info_list(List<FileSystemDock::FileInfo> &r_file_list) {
	
	switch (file_sort) {
		case FILE_SORT_TYPE:
			r_file_list.sort_custom<FileInfoTypeComparator>();
			break;
		case FILE_SORT_TYPE_REVERSE:
			r_file_list.sort_custom<FileInfoTypeComparator>();
			r_file_list.reverse();
			break;
		case FILE_SORT_MODIFIED_TIME:
			r_file_list.sort_custom<FileInfoModifiedTimeComparator>();
			break;
		case FILE_SORT_MODIFIED_TIME_REVERSE:
			r_file_list.sort_custom<FileInfoModifiedTimeComparator>();
			r_file_list.reverse();
			break;
		case FILE_SORT_NAME_REVERSE:
			r_file_list.sort();
			r_file_list.reverse();
			break;
		default: 
			r_file_list.sort();
			break;
	}
}
void FileSystemDock::_update_file_list(bool p_keep_selection) {