Returns a mask indicating which drag operations are allowed by the sender.
Original signature is '- (NSUInteger)webView:(WebView *)sender dragDestinationActionMaskForDraggingInfo:(id <NSDraggingInfo>)draggingInfo'
Available in Mac OS X v10.3.9 and later.

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NSUInteger WebViewDragDestinationActionMaskForDraggingInfo( WebView sender, INSDraggingInfo draggingInfo )
Function WebViewDragDestinationActionMaskForDraggingInfo ( _ sender As WebView, _ draggingInfo As INSDraggingInfo _ ) As NSUInteger
NSUInteger WebViewDragDestinationActionMaskForDraggingInfo( WebView^ sender, INSDraggingInfo^ draggingInfo )

- sender (WebView)
- The web view that sent the message.
- draggingInfo (INSDraggingInfo)
- The information object for the dragging operation.

A mask that indicates which drag operations are allowed when content is dragged over the sending web view. (Note that the return value changed from an unsigned int to an NSUInteger in Mac OS X v10.5.) See “Drag-Destination Actions” for a list of return values.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)