Parallel execution of QGIS algorithms

This is just an example of the advantage provided by the multithreading on the Toolbox. As each algorithm is running in a separate thread, this allows us to run more than one algorithm at the same time.


I’m polishing the implementation and trying to find some major problems in the current implementation.  It has some minor bugs that can be easily solved by adding a parameter to the  cancel signal (e.g. when you have two algorithms running and try to cancel one of them, the signal emitted will cancel two algorithms instead of just one)


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