Problem - Safari - NPAPI Plugin - Right|button|downMouseDragged event.

Good morning to everyone. I think I exposed the main aspects of my question on the subject, so nobody will lose time if it's not really interested.
I'm experiencing a problem developing a plugin (using NPAPI for future portability), that requires the mouse dragged event with right mouse button. With Chrome I have no problem. With Safari everything is ok, when I press the left mouse button; but when I press the right button, the browser can't sense at all any other event, except the NPCocoaEventMouseDown event.
Is it a bug? Should I open a ticket?
Any clue?
Thanks in advance.
G.

https://bugs.webkit.org/show_bug.cgi?id=27043
Hope that Apple soon implements the patch, that already exists.
Regards.
G.

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