showRaw method
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Implementation
void showRaw({required WidgetBuilder contentBuilder}) {
if (_overlay != null) return;
final overlay = _navigatorKey?.currentState?.overlay;
assert(overlay != null, '请先调用 FloatingWindowManager.configure(navigatorKey: ...)');
if (overlay == null) return;
_overlay = OverlayEntry(
builder: (_) => FloatingWindowWidget(
manager: this,
contentBuilder: contentBuilder,
),
);
overlay.insert(_overlay!);
}