(workaround, not actual solution)
The easiest way is to clone the git repository by pointing your NetBeans instance to this set of files (cloned git repo).
If you want to return to the SVN / Git repo, in a command line session, return to this first mixed repo, pull git from the second repo (to revert all changes) and go to NetBeans, configure the first mixed repo to read and work mainly with SVN.
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