### 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
if (to_rename.path == "res://") {
					break;
				}
				if (tree->has_focus()) {
					
					tree->edit_selected(true);
					if (to_rename.is_file) {
						String name = to_rename.path.get_file();
						tree->set_editor_selection(0, name.rfind("."));
					} else {
						String name = to_rename.path.left(-1).get_file(); 
						tree->set_editor_selection(0, name.length());
					}
				} else if (files->has_focus()) {
					files->edit_selected();
				}
			}
		} break;
		case FILE_REMOVE: {
			
			Vector<String> remove_files;
			Vector<String> remove_folders;
			Vector<String> collapsed_paths = _remove_self_included_paths(p_selected);
			for (int i = 0; i < collapsed_paths.size(); i++) {
				String fpath = collapsed_paths[i];
				if (fpath != "res://") {
					if (fpath.ends_with("/")) {
						remove_folders.push_back(fpath);
					} else {
						remove_files.push_back(fpath);