`choose_representative` has been in the catalog since the grouping landed,
with tests behind it and nothing calling it. So the frame a folded burst drew
was always the earliest one, and the only way to disagree was to open the
group and leave it open — which is to say there was no way to disagree at all,
because a burst that stays open is a burst that was never collapsed.
The earliest frame is the right default and it is deliberately not a
judgement: nothing here scores a photograph, and FR-CULL-5 names the failure
that rule avoids. But the whole point of a burst is that one of the twelve is
better than the other eleven, and the person who knows which is the one
looking at them.
So a ring on each frame of an open group, ticked on the one the group folds
to. It is drawn only while the burst is open, because that is the one moment
the alternatives are on screen to be compared — offering the choice on a
folded burst would be asking about frames it is hiding. Bottom right, opposite
the count in the other corner, clear of the flag and the collection badge and,
deliberately, of the trash target: a slip between the ring and the fifth star
sets a rating, which is the harmless direction for an ambiguous press.
The mark stays live on the frame that already wears it. A disabled TouchArea
would let the press fall through to the cell behind it, so tapping the one
ring that is ticked would have opened the photograph — and pressing it is a
thing the user may mean anyway: it records the choice the default was making
silently, which then survives a regroup that finds an earlier frame.
Choosing repaints the badges instead of reloading the window, which is what
separates it from folding a group up. Folding changes what the grid's query
returns; this changes only which cell wears the tick, and the tick has to
leave the frame that was carrying it, so the whole window is refilled in the
one statement `sync_badges` already runs.
The gesture is documented where FR-UI-4 requires it to be documented: in a
tagged comment beside the control, which is the only copy. The gesture book,
the gesture document and the requirements matrix are regenerated from the tree
alongside it.
dtourolle
1c5c55b4c9