### 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
icon = folder_icon;
				if (searched_string.length() == 0 || text.to_lower().find(searched_string) >= 0) {
					files->add_item(text, icon, true);
					files->set_item_metadata(-1, favorite);
				}
			} else if (favorite.ends_with("/")) {
				text = favorite.substr(0, favorite.length() - 1).get_file();
				icon = folder_icon;
				if (searched_string.length() == 0 || text.to_lower().find(searched_string) >= 0) {
					files->add_item(text, icon, true);
					files->set_item_metadata(-1, favorite);
				}
			} else {
				int index;
				EditorFileSystemDirectory *efd = EditorFileSystem::get_singleton()->find_file(favorite, &index);
				FileInfo fi;
				fi.name = favorite.get_file();
				fi.path = favorite;
				if (efd) {
					fi.type = efd->get_file_type(index);
					fi.import_broken = !efd->get_file_import_is_valid(index);
					fi.modified_time = efd->get_file_modified_time(index);
				} else {
					fi.type = "";
					fi.import_broken = true;
					fi.modified_time = 0;
				}
				if (searched_string.length() == 0 || fi.name.to_lower().find(searched_string) >= 0) {
					file_list.push_back(fi);
				}