Ariadne

Improved behavior when a scanner session is accessed from different threads

• Previously, a scanner session could be created by a certain thread (HTTP transfer), and later, or concurrently, be accessed from a different thread (HTTP transfer).
• For SANE backends that are not thread-safe, this could lead to unexpected behavior, especially for ADF scans where each page is transferred as a separate HTTP transfer.
• Now, each SANE session is running in its own thread, which should mitigate such problems.