[SlimDevices: Beta] Text scrolling in 6.5

[GoCubs]

I'm trying to update SuperDateTime to support the new display hash in
6.5.

In one situation I need the text on line one to be centered, and the
text on line two to be left justified/scrolling.  I figured this would
do it:

return {
	'overlay' => [ $overlay . $status, undef ],
	'center'  => [ $displayLine1, undef ],	
	'line'    => [ undef, $displayLine2 ],
};

This properly centers line 1 and left justifies line 2, but it does not
scroll line 2.  The player's preference is set to standard scrolling.

The documentation states:
The default operation of scrolling for a player is set via preference
'scrollMode', but can be overridden by the parameter sent to update. It
is no longer overridden by a component in the display hash.

What needs to be sent to update to override the scroll mode?

-Greg


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