The Widget Inspector in Flutter relies on source instrumentation to map widgets in the widget tree to their corresponding source code locations. This is enabled by the --track-widget-creation flag, which is on by default when running in debug mode. This flag allows the Inspector to associate widgets with their creation points in your project's source code.
However, this mechanism primarily works for widgets defined within your project's root directory or explicitly included package directories. External widgets (e.g., those from packages like flutter_material.dart, cupertino, or third-party packages on pub.dev) are typically not included in this mapping because their source code resides outside your project’s directory structure.