Nyall Dawson 981afb3da1 Make QgsLocator more thread safe
- add a clone() method to filters, and always search using the
clone instead of the original filter
- add a prepare() method to filters, which is always run in the
main thread and can be used to prepare the filter for safe
background execution (e.g. creating feature iterators in advance)
- don't use QtConcurrent to perform searches in background threads,
since it is not safe to use with QObjects
- instead manually create threads and ensure that cloned objects
are always moved to the thread that they will run in, to ensure
that they correctly have thread affinity with the thread in which
they are executed
2018-02-12 20:26:26 +10:00
..
2018-02-12 20:26:26 +10:00
2018-01-06 10:33:14 +01:00
2017-09-28 13:22:37 +02:00