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Fix QT connection in Catalyst exporter

Michael Migliore requested to merge michael.migliore/paraview:renaming-perf into master

Fix #18648 (closed)

The method Update is called when a filter is renamed.
This method loop on the pipeline and create a new connection on renamed signal to Update slot leading to exponential QT connection creation.
This MR disconnects existing signal before creating a new one.

Edited by Michael Migliore

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