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Has bugs updating things if the bestlink of a page changes due to
adding/removing a page. For example, if Foo/Bar links to "Baz", which is
Foo/Baz, and Foo/Bar/Baz gets added, it will update the links in Foo/Bar
to point to it, but will forget to update the backlinks in Foo/Baz.
The buggy code is in refresh(), when it determines what
links, on what pages, have changed. It only looks at
changed/added/deleted pages when doing this. But when Foo/Bar/Baz
is added, Foo/Bar is not changed -- so the change it its
backlinks is not noticed.
To fix this, it needs to consider, when rebuilding Foo/Bar for the changed
links, what oldlinks Foo/Bar had. If one of the oldlinks linked to
Foo/Baz, and not links to Foo/Bar/Baz, it could then rebuild Foo/Baz.
Problem is that in order to do that, it needs to be able to tell that
the oldlinks linked to Foo/Baz. Which would mean either calculating
all links before the scan phase, or keeping a copy of the backlinks
from the last build, and using that. The first option would be a lot
of work for this minor issue.. it might be less expensive to just rebuild
all pages that Foo/Bar links to.
Keeping a copy of the backlinks has some merit. It could also be
incrementally updated.
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And if Foo/Bar/Baz is then removed, Foo/Bar gets a broken link,
instead of changing back to linking to Foo/Baz.
This old bug still exists as of 031d1bf5046ab77c796477a19967e7c0c512c417.
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