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…t any time clear the contents of the processing queue
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At some of our beamlines, we use the plugin queues extensively to allow for keeping up with our faster cameras and detectors. Occasionally, however, some external issue (such as a motor following error) causes a failure mid-scan. Our scanning code closes the file plugins and stops the acquistion stream, but there currently is no way to clear the frames in a queue to be immediately ready for the next scan.
This PR adds a new PV for clearing a plugin's queue, for exactly this reason. Also added are unit tests for the new function.
I have yet to test this on a real setup but will plan to do so tomorrow. I'll also need to update the plugin operator screens.