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7565b20b50
Previously ObjectLinkingLayer held unique ownership of Plugins, and links always used the Layer's plugin list at each step. This can cause problems if plugins are added while links are in progress however, as the newly added plugin may receive only some of the callbacks for links that are already running. In this patch each link gets its own copy of the pipeline that remains consistent throughout the link's lifetime, and it is guaranteed that Plugin objects (now with shared ownership) will remain valid until the link completes. Coding my way home: 9.80469S, 139.03167W