This will be used in conjunction with vfs plugins that detect whether a
file has a pending hydration/dehydration through independent means and
communicate that to the discovery through local file type.
Since 'placeholder' just means that it's an item of the special type
that the vfs plugin can deal with - no matter whether hydrated or
dehydrated - all done items should become placeholders. Even
directories.
Now every file that passes through updateMetadata() will be converted to
a placeholder if necessary.
On Linux and Windows the file watcher can't distinguish between changes
that were caused by the process itself, like during a sync operation,
and external changes. To work around that the client keeps a list of
files it has touched and blocks notifications on these files for a bit.
The duration of this block was originally and arbitrarily set at 15
seconds. During manual tests I regularly thought there was a bug when
syncs didn't trigger, when the only problem was that my changes happened
too close to a previous sync operation.
This change reduces the duration to three seconds. I imagine that this
is still enough.
Also use std::chrono while at it.
Also, calling deleteLater() on jobs is unnecessary (they autodelete
after finished()) and deleting the attached QSettings is also
unnecessary because the settings object is parented to the job.
Seeing "Currently available online only" for a currently hydrated file
was odd. It makes sense since current hydration status and pin state are
independent.
The new text will say something like "Currently available, but marked
online only" to better indicate that the file might be dehydrated later
since it wasn't pinned.
supportsSelectiveSync(): clearer than !supportsVirtualFiles() and allows
extra logic
isVfsOnOffSwitchPending(): Somewhat awkward way of dealing with the
phase between a user requesting vfs state to be switched and it
actually happening
slotDiscoveryJobFinished -> slotDiscoveryFinished
slotFinished -> slotPropagationFinished
This should be clearer. Particular the
slotFinished -> finalize -> emit finished()
chain was confusing before.
This allows enabling and disabling vfs.
To distinguish this operation from setting the root pin state, the
availability setting is adjusted as well to be similar to the
menu that shows in the shell extensions.
It has a destructor and these operations make sense. Particularly the
move is important for code like:
Result<x, y> foo() { Result<x, y> v; return v; }
because the move-ctor will not autogenerate if x or y are not trivially
destructible.
