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ParaView propagates CMAKE_PREFIX_PATH to Catalyst Adaptors.

Robert Maynard requested to merge (removed):propagate_search_paths_to_catalyst_adaptors into master

Fixes #18224 (closed) ParaView uses add_custom_command to build all the catalyst adaptors. This means that any package find calls that occur when including ParaView's Config Module need to be part of the search path for the adaptor.

The easiest way is to make sure that CMAKE_PREFIX_PATH is propagated through add_custom_command as it is the most common way of specifying where to search.

Note: That as more projects move over to import targets this approach will continue to fail especially if they specify the search directories using <Package>_ROOT. Long term the catalyst adaptors will need to become an external project or stop using add_custom_command.

backport: release

Edited by Chuck Atkins

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