Telegram echoes back the client-controlled inline_query.offset string on
every inline query. build_inline_results passed it through int() and
used it directly as a slice start, so a negative offset indexed the
catalog from the tail: small catalogs served their last few entries with
negative-prefixed result ids, and larger catalogs could return an empty
page with a misleading next_offset that skipped most of the catalog.
Clamp the parsed offset to >= 0. Malformed offsets still fall back to
page zero via the existing except path, and valid pagination is
unchanged.
8e85a0fd8c