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* [client] Keep the route selection when every requested ID is unavailable
A non-append SelectRoutes() wipes the current selection before applying
the requested one, but it validated the requested IDs only afterwards,
while already mutating. A request naming no available route at all left
every route deselected and returned an error - so a typo in a route ID
silently dropped the user's exit node, and the routes stayed applied
while the selector claimed nothing was selected.
Validate first and bail out before touching any state when nothing in
the request is available. A request with at least one available route
keeps applying the valid part and reporting the rest, and an empty
request still deselects everything, since that is the caller asking for
exactly that rather than a failed lookup.
* [client] Trim the new comments to the contributing guide's length budget
CONTRIBUTING.md caps comments at 90 characters per line and roughly 250
per comment. The three comments added by this PR were over both limits.
The test comments also restated their own test names, so they lose that
half and keep only the why.
* [client] Apply the route selection even when some IDs are unknown
SelectRoutes and DeselectRoutes returned the error before TriggerSelection,
so a request mixing valid and unknown network IDs changed the selector but
never reached the routing table. The valid routes read as selected while
`ip route` showed nothing.
Trigger the selection first and return the error afterwards. The inner
selectRoutes already applied the valid part of a partial request, only the
outer layer dropped it.
* [client] Publish the network selection event on a partial failure
Returning early on error was correct while an error meant nothing had
happened. A partial failure now changes the selection and the routing
table, so returning first left the change with no trace in the event log
or the UI, even though the new state had already been broadcast.
* [client] Cover the append and deselect-all paths of the selection guard
The append path was never destructive and behaves the same with or without
the early return, so that case is characterization rather than a regression
test. The deselect-all case is a real guard: the early return also skips
resetting deselectAll, so a typo no longer drops the "nothing selected,
including future networks" policy.
* [client] Pin that a fully invalid selection disturbs nothing
The selection is now applied on every request, including one where no ID is
known and the selector is left untouched. Nothing may be torn down or
reinstalled on that path.
* Revert "[client] Publish the network selection event on a partial failure"
This reverts commit 26219592.
The event would lie on the opposite path: when no requested ID is available
the selector is left untouched, so an unconditional publish reports a change
that never happened. Telling that case from a partial failure needs the
manager to report whether anything was applied, which is a new signal in its
API and does not belong in a PR about the selector guard. Follow-up instead.
---------
Co-authored-by: Riccardo Manfrin <3090891+riccardomanfrin@users.noreply.github.com>