ParaView automatically replaces an algorithm's executive when it doesn't need to or maybe shouldn't
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
In vtkSISourceProxy, an algorithm's executive is automatically replaced with a given executive. Reasons to avoid this:
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if it is the same executive, we have unneeded computation
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if it is an executive that is derived from the requested executive it replaces the desired one with a superclass of it. For algorithms with specialized executives that are set as the default executive for them it will replace them.