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Fix handling of multiple namespaced python packages in devel space #1153

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@rhaschke rhaschke commented Oct 16, 2021

If there are multiple python packages to be installed below a common namespace, only the last one installed is found in devel space, because the path extension is always overwritten.
This PR augments the existing __extended_path instead of overriding it.
We need this feature for MoveIt, which has multiple python packages to be installed in the common namespace moveit.

If there are multiple packages to be installed below a common namespace, only the last one installed is found in devel space,
because the path extension is always overwritten.
This PR augments the existing __extended_path.
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Hm. Unfortunately, this works only with catkin tools and merged devel space as well as with catkin_make. 😦
catkin tools with a linked devel space fails because linking multiple __init__.py files to the same final devel location fails.
catkin_make_isolated fails because the init files are installed in different locations and only the first one on PYTHONPATH will define its src extension path.

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