The whole source-control snapshot the host projects to a vcs:read frame. Plain JSON — never a DiffResult / FileSystem / Journal.
vcs:read
DiffResult
FileSystem
Journal
True while the host is recomputing the diff — the panel shows a spinner without a separate request (plan gotcha).
The whole source-control snapshot the host projects to a
vcs:readframe. Plain JSON — never aDiffResult/FileSystem/Journal.