Item15052: Support a cover plus skin as the publishskin

-- BramVanOosterhout - 20 Nov 2021

Pushed to github. Package to be released 14 Dec 2021.

The publishskin parameter insists on a single value. covers that modify a skin (for instance mycover,pattern are rejected.

Publisher.pm line 77-81

   publishskin => {
        default   => 'basic_publish',
        validator => \&validateWord,
        desc      => 'Publish Skin'
    },

Foswiki::Func::readTemplate supports a comma separated list for the skin parameter, so the logic in Publisher.pm line 544-546 would support multiple values.

    $this->{skin_template} =
      Foswiki::Func::readTemplate( $this->{opt}->{template},
        $this->{opt}->{publishskin} );

I am changing line 77-81 to:

 publishskin => {
        default   => 'basic_publish',
        validator => sub {
                validateList( @_, \&validateWord );
                },
        desc      => 'Publish Skin'
    },

to support the use of a cover over an existing skin as the publishskin.

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