: NONE, fake return of zero
To flush the display to the hardware screen.
Flush the display to the hardware, or do nothing.
Does nothing. Note the macintosh has a flush/sync logic embedded in the ioShowDisplay
which does a flush/sync every 20 ms, and a flush/sync in the getNextEvent logic to ensure any
left over bits are flushed.
The iPhone logic takes the queued screen updates and bundles them as a unioned update for the drawing cycle.
May flush, may not depending on X configuration
As a side effect it hides the splash window and shows the squeak window. If the VM is not defering updates and if the parm for fDeferredUpdate is set then we do the UpdateWindow