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Minimal test - lines (21, 68)

Code

class nsDragService : public nsBaseDragService {
 public:
  nsDragService();

  // nsBaseDragService
  MOZ_CAN_RUN_SCRIPT virtual nsresult InvokeDragSessionImpl(
      nsIArray* anArrayTransferables, const mozilla::Maybe& aRegion,
      uint32_t aActionType) override;
  // nsIDragService
  MOZ_CAN_RUN_SCRIPT NS_IMETHOD EndDragSession(bool aDoneDrag, uint32_t aKeyModifiers) override;
  NS_IMETHOD UpdateDragImage(nsINode* aImage, int32_t aImageX, int32_t aImageY) override;

  // nsIDragSession
  NS_IMETHOD GetData(nsITransferable* aTransferable, uint32_t aItemIndex) override;
  NS_IMETHOD IsDataFlavorSupported(const char* aDataFlavor, bool* _retval) override;
  NS_IMETHOD GetNumDropItems(uint32_t* aNumItems) override;

  void DragMovedWithView(NSDraggingSession* aSession, NSPoint aPoint);

 protected:
  virtual ~nsDragService();

 private:
  // Creates and returns the drag image for a drag. aImagePoint will be set to
  // the origin of the drag relative to mNativeDragView.
  NSImage* ConstructDragImage(nsINode* aDOMNode,
                              const mozilla::Maybe& aRegion,
                              NSPoint* aImagePoint);

  // Creates and returns the drag image for a drag. aPoint should be the origin
  // of the drag, for example the mouse coordinate of the mousedown event.
  // aDragRect will be set the area of the drag relative to this.
  NSImage* ConstructDragImage(nsINode* aDOMNode,
                              const mozilla::Maybe& aRegion,
                              mozilla::CSSIntPoint aPoint, mozilla::LayoutDeviceIntRect* aDragRect);

  bool IsValidType(NSString* availableType, bool allowFileURL);
  NSString* GetStringForType(NSPasteboardItem* item, const NSString* type,
                             bool allowFileURL = false);
  NSString* GetTitleForURL(NSPasteboardItem* item);
  NSString* GetFilePath(NSPasteboardItem* item);

  nsCOMPtr mDataItems;  // only valid for a drag started within gecko
  ChildView* mNativeDragView;
  NSEvent* mNativeDragEvent;

  bool mDragImageChanged;
};