make preferences dialog non-modal to circumvent mac modality bugs. r=matt, sr=blake git-svn-id: svn://10.0.0.236/trunk@98787 18797224-902f-48f8-a5cc-f745e15eee43
make preferences dialog non-modal to circumvent mac modality bugs. r=matt, sr=blake git-svn-id: svn://10.0.0.236/trunk@98787 18797224-902f-48f8-a5cc-f745e15eee43