Fix #32: force full egs_view repaints, for OS X
Fix #32: force full egs_view repaints, for OS X

nrc-cnrc/EGSnrc,ftessier/EGSnrc,mchamberland/EGSnrc,crcrewso/EGSnrc,marenaud/EGSnrc,nrc-cnrc/EGSnrc,ftessier/EGSnrc,MartinMartinov/EGSnrc,mchamberland/EGSnrc,crcrewso/EGSnrc,crcrewso/EGSnrc,nrc-cnrc/EGSnrc,ftessier/EGSnrc,mchamberland/EGSnrc,MartinMartinov/EGSnrc,crcrewso/EGSnrc,marenaud/EGSnrc,MartinMartinov/EGSnrc,crcrewso/EGSnrc,nrc-cnrc/EGSnrc,nrc-cnrc/EGSnrc,ftessier/EGSnrc,MartinMartinov/EGSnrc,mchamberland/EGSnrc,marenaud/EGSnrc,mchamberland/EGSnrc,marenaud/EGSnrc,marenaud/EGSnrc,MartinMartinov/EGSnrc,marenaud/EGSnrc,ftessier/EGSnrc,ftessier/EGSnrc,mchamberland/EGSnrc