### 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
drop_position = 0;
		} else if (ti == resources_item) {
			
			drop_position = dirs.size();
		} else {
			
			drop_position = dirs.find(ti->get_metadata(0));
			if (drop_section == 1) {
				drop_position++;
			}
		}
		
		Vector<int> to_remove;
		int offset = 0;
		for (int i = 0; i < drag_files.size(); i++) {
			int to_remove_pos = dirs.find(drag_files[i]);
			to_remove.push_back(to_remove_pos);
			if (to_remove_pos < drop_position) {
				offset++;
			}
		}
		drop_position -= offset;
		to_remove.sort();
		for (int i = 0; i < to_remove.size(); i++) {
			dirs.remove_at(to_remove[i] - i);
		}
		
		for (int i = 0; i < drag_files.size(); i++) {
			dirs.insert(drop_position, drag_files[i]);
			drop_position++;