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Neil
59a9da22a0
No host ever read intent: 'gesture'. The client stops sending it, the params schema strips it from older clients, and docs/reference records the rule that a snapshot never carries intent.
19 lines
1.1 KiB
Markdown
19 lines
1.1 KiB
Markdown
# Snapshots never carry intent
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A client and a host exchange two kinds of payload: a **snapshot** (the whole state as the sender
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sees it now, such as a pane layout) and a **delta** (what the user just did). They update
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independently, so a snapshot may be resent, replayed or reordered by either side.
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The rule: a snapshot never carries intent. Anything the receiver should treat as a user's action
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travels as an explicit, optional delta field that names exactly what changed.
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- A tag on the whole snapshot ("this push was a gesture") can't say which part of it the user
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changed, so the receiver either ignores it or applies it to fields the user never touched.
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- An optional delta field is safe for older peers: one that doesn't know it drops it and keeps
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today's snapshot behaviour.
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Example: `session.tabs.updatePaneLayout` sends the full layout and `titlesByLeafId` as the snapshot,
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and `renamedLeafIds` as the delta (the panes the user renamed in this edit). The retired
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`intent: 'gesture'` tag is stripped unread by the params schema, so older clients that still send it
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keep working.
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