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CEA-608: Don't assume roll-up captions are at the bottom of the screen
ANSI/CTA-608-E R-2014 Annex B.5 says: "The concept of a movable base row for a roll-up caption is new." It means "new" compared to TC1 and TC2 (released in or before 1985). Issue: #7475 PiperOrigin-RevId: 315258859
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How will the location on the screen change if we receive a mode change from 2 Rows rolling to 4 rows rolling, but no other changes? I would expect that roll-up captions must have Cue.ANCHOR_TYPE_END, otherwise the mode changes might break the alignment.
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If the cue text content doesn't change (only the roll-up count) then the current code should display the cues in the same place.
I've sent a follow-up change which considers the roll-up count - will link it here once it's pushed.
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This commit updates my change: 947485e