Part of #2966. The History panel's camera button takes a named snapshot
of the document ("Snapshot N", not a history state). Snapshots are
listed under the opening state with a thumbnail and scroll with the
states; clicking one returns the document to it as one new, undoable
state named after it. A double-click or right-click › Rename… renames
it in place, and right-click › Delete removes it. Snapshots live for the
session only, as in Photoshop.
For agents: history.newSnapshot {name?, from?: fullDocument |
mergedLayers | currentLayer}, history.selectSnapshot, renameSnapshot and
deleteSnapshot, addressed by ids that are never reused, and doc.inspect
reports snapshots.
F4LCON
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