Nyall Dawson 12fcfac0d5 [processing] Ensure algorithms which add attributes to features
always add a consistent amount of attributes regardless of the
code paths taken

Some algorithms were adding features to data providers with
different number of attributes vs the layer's fields - this is
not supported and depending on the data provider will have
different (bad) results.
2018-02-15 17:45:00 +11:00
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