the ycrop option allows vncviewer to hide bottom of the frame. However, it still sends FrameBufferUpdateRequests of the total size of the frame.
So, the server sends updates about all the frame, even the hidden part.
The idea is to enhance this feature to makes vncviewer to request only a specific piece of the frame.
For instance, this may be used to set up a display wall, with several vncviewers displaying tiling areas of one vnc server.
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