Nyall Dawson 6e06c32a10 [processing] Fix crash when an algorithm dialog is left open and
processing options are changed

Make sure the algorithm dialogs use their own copy of algorithms,
instead of the copies owned by the processing registry. Opening
processing options triggers a full reload of providers, deleting
all existing algorithm instances from the registry first.
2018-09-25 10:32:20 +10:00
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