The SSD16xx driver used to use the SCREEN_INFO_DOUBLE_BUFFER flag to
indicate to the LVGL integration that it needs writes to be performed
twice. This was required because partial writes require both the old
and new buffer to be written.
This behavior is really an implementation detail and only applies to
partial refresh. Do this buffer maintenance in the driver instead.
Signed-off-by: Andreas Sandberg <andreas@sandberg.uk>
