Merge pull request #8579 from hahla/devel

Fix issue #8578. Setting envvar in ""'s ensures the PYTHONPATH is set to

hacking/env-setup.fish

@@ -16,7 +16,7 @@ else
         case "$PREFIX_PYTHONPATH*"
         case "*"
             echo "Appending PYTHONPATH"
-            set -gx PYTHONPATH $PREFIX_PYTHONPATH:$PYTHONPATH
+            set -gx PYTHONPATH "$PREFIX_PYTHONPATH:$PYTHONPATH"
     end
 end