[Bug 48922] find by category returns false positives

[TM]

Public bug reported:

Binary package hint: gthumb

When sorting images by category using the "find" feature of gThumb, the
search results contain false hits if one category name is a substring of
another category name.  For example, if I have two categories, one
called "foo" and another called "foobar" and I use the "find" feature to
search for all images of category "foo", the search results will include
all images in category "foo" and all images in category "foobar".  The
correct behavior should be to return only images in category "foo".

** Affects: gthumb (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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find by category returns false positives
https://launchpad.net/bugs/48922