### 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
fpath = fpath.substr(slash_idx + 1, fpath.size() - slash_idx - 1);
				}
				tree_item = tree->get_item_with_text(fpath);
				if (tree_item) {
					tree_item->select(0);
				}
			}
		}
	}
	Ref<InputEventKey> key = p_event;
	if (key.is_valid() && key->is_pressed() && !key->is_echo()) {
		if (ED_IS_SHORTCUT("filesystem_dock/duplicate", p_event)) {
			_file_list_rmb_option(FILE_DUPLICATE);
		} else if (ED_IS_SHORTCUT("filesystem_dock/copy_path", p_event)) {
			_file_list_rmb_option(FILE_COPY_PATH);
		} else if (ED_IS_SHORTCUT("filesystem_dock/delete", p_event)) {
			_file_list_rmb_option(FILE_REMOVE);
		} else if (ED_IS_SHORTCUT("filesystem_dock/rename", p_event)) {
			_file_list_rmb_option(FILE_RENAME);
		} else if (ED_IS_SHORTCUT("filesystem_dock/show_in_explorer", p_event)) {
			_file_list_rmb_option(FILE_SHOW_IN_EXPLORER);
		} else if (ED_IS_SHORTCUT("editor/open_search", p_event)) {
			focus_on_filter();
		} else {
			return;
		}
		accept_event();
	}
}
bool FileSystemDock::_get_imported_files(const String &p_path, String &r_extension, Vector<String> &r_files) const {