* Part: fix Part_EditAttachment nesting handling
Fixes#26264.
The previous 'fix' (#25887) did not consider that the object to-be-attached may not be in the global space.
The code in this PR has been tested on the forum:
https://forum.freecad.org/viewtopic.php?p=862968#p862968
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
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