fix duplicates in installable_rhino_packages

Author: gonzalocasas

CHANGELOG.md

@@ -16,6 +16,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+* Fixed rhino packages installation to remove duplicates
+
 ### Removed
 
 

src/compas_rhino/install.py

@@ -247,7 +247,7 @@ def _filter_installable_packages(version, packages):
 
     if not packages:
         # Flatten list of results (resulting from collect_all pluggable)
-        packages = list(itertools.chain.from_iterable(installable_rhino_packages()))
+        packages = sorted(set(itertools.chain.from_iterable(installable_rhino_packages())))
     elif 'compas_ghpython' in packages and ghpython_incompatible:
         print('Skipping installation of compas_ghpython since it\'s not supported for Rhino 5 for Mac')