The develop view reported a remote original on its way through the
error message, so it read "Could not load image" over "Downloading…".
It did so on every step along the roll, including a cached frame that
was ready within a tick, so each step flashed the error.
Waiting is now its own state. On the step, the grid's thumbnail of the
photograph stands in at once. Only when a transfer is really on the
wire does it dim under "Not on this device yet", with a line like
"Downloading — 12.4 of 38.0 MB" and a progress bar.
The bytes come from a new RemoteBackend::get_reporting. The Nextcloud
backend overrides it to read the body chunk by chunk; the default
reports once at the end. Progress is kept in the in-flight registry by
path, because a step usually lands on a frame the prefetcher is already
fetching. The catalog's file length stands in when the server sends no
Content-Length.
dtourolle
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