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Split QgsVectorFileWriter writeAsVectorFormat into two methods 
to allow correct thread-safe usage

There is now a prepare method, which must be run on the main
thread and which prepopulates feature iterators and clones
renderers, and a separate write method which is safe to
execute on background threads (e.g. tasks)

Fixes #18516

(cherry-picked from 95d2a27)
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@nyalldawson
nyalldawson committed Apr 2, 2018
1 parent d70181c commit d88ffc6
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