Ensure font-family declaration is not added more than once #14
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I recently ran into issues using postcss-object-fit-images on a project
where the PostCSS processing was done on LESS source files, rather than
on the compiled CSS. Since the files were being modified in place, the
font-family declaration was being added every time the tool made a pass
through the file, meaning after a few compiles we ended up with a huge
list of duplicate font-family declarations.
This PR adds a filter step, which removes the plugins own output from
the existing font family declaration, to ensure that it is never added
more than once.