Nyall Dawson b637c7fe22 Prevent background execution of zonal stats
This algorithm is NEVER safe to run in the background, because
it directly modifies a layer in place.

We should:
- make a variant of this algorithm which returns a new layer
AND
- refactor the QgsZonalStats code to create a separate map
of feature->stats, and then modify the existing Zonal Stats
algorithm to apply these changes in a post processing step
2018-06-08 10:13:13 +10:00
..
2017-12-21 17:55:02 +01:00
2018-04-10 10:15:19 +10:00