BREAKING CHANGE: The +org-roam-open-buffer-on-find-file variable was
renamed to +org-roam-auto-backlinks-buffer *and* is now disabled by
default. When this is non-nil, it will open the *org-roam* backlinks
side window when roam files are visible, and close it when they aren't.
This change also makes this behavior a little more robust, but is
understandably not everybody's (read: most people's) cup of tea, so it
is now opt-in.
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