Returns a mask indicating which drag-source actions are allowed for a drag that begins at the specified location.
Original signature is '- (NSUInteger)webView:(WebView *)sender dragSourceActionMaskForPoint:(NSPoint)point'
Available in Mac OS X v10.3.9 and later.

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NSUInteger WebViewDragSourceActionMaskForPoint( WebView sender, NSPoint point )
Function WebViewDragSourceActionMaskForPoint ( _ sender As WebView, _ point As NSPoint _ ) As NSUInteger
NSUInteger WebViewDragSourceActionMaskForPoint( WebView^ sender, NSPoint point )

A mask indicating which drag-source actions are allowed. (Note that the return value changed from an unsigned int to an NSUInteger in Mac OS X v10.5.) See “Drag-Source 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)