#297919

r=brendan, sr=bz
event.button in a mouse move should be 0 to maintain compatibility with older browsers
this went on the trunk and 1.8.0 - forgot 1.8


git-svn-id: svn://10.0.0.236/branches/MOZILLA_1_8_BRANCH@194408 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/events/src/nsDOMMouseEvent.cpp

@@ -181,7 +181,7 @@ nsDOMMouseEvent::GetButton(PRUint16* aButton)
       break;
     default:
       // This event doesn't have a mouse button associated with it
-      *aButton = (PRUint16)-1;
+      *aButton = (PRUint16)0;
       break;
     }
   }