### 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
da->make_dir_recursive(new_path.get_base_dir());
		if (FileAccess::exists(old_path + ".import")) {
			Error err = da->copy(old_path, new_path);
			if (err != OK) {
				EditorNode::get_singleton()->add_io_error(TTR("Error duplicating:") + "\n" + old_path + ": " + error_names[err] + "\n");
				return;
			}
			
			Ref<ConfigFile> cfg;
			cfg.instantiate();
			cfg->load(old_path + ".import");
			cfg->erase_section_key("remap", "uid");
			err = cfg->save(new_path + ".import");
			if (err != OK) {
				EditorNode::get_singleton()->add_io_error(TTR("Error duplicating:") + "\n" + old_path + ".import: " + error_names[err] + "\n");
				return;
			}
		} else {
			
			if (ResourceLoader::get_resource_uid(old_path) == ResourceUID::INVALID_ID) {
				Error err = da->copy(old_path, new_path);
				if (err != OK) {
					EditorNode::get_singleton()->add_io_error(TTR("Error duplicating:") + "\n" + old_path + ": " + error_names[err] + "\n");
				}
				return;
			}
			
			Error err;
			Ref<Resource> res = ResourceLoader::load(old_path, "", ResourceFormatLoader::CACHE_MODE_REUSE, &err);
			if (err == OK && res.is_valid()) {