Add Message_ToggleBackdrop to allow the backdrop to be moved to front or back.
Detail: The Message_ToggleBackdrop has been introduced by ROL in one of their Select releases. In order to bring the RISC OS 5 API closer the ROL branch this changeset aims to add this message to RO5. Applications can broadcast Message_ToggleBackdrop to request that the backdrop application moves the backdrop. The message can be used to move the backdrop to the front, the back, toggle it or to get notified of the backdrop's current position. After the backdrop has been moved, this message is sent back to the application to notify it of the backdrop's new position. Message_ToggleBackdrop &400D1: +0 = 24 (Message size) +4 = Backdrop controlling application +8 = My reference number +12 = Your reference number +16 = &400D1 (Message_ToggleBackdrop) +20 = Flags (if not present, assumed 0) b0-1 = type of toggle 0 = toggle 1 = front 2 = back 3 = notify of status other = reserved Admin: Tested on RO 5.16 Author: Fred Graute Version 0.90. Tagged as 'Pinboard-0_90'
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