'search' appearance doesn't work in combination with another appearance that contains hyphen dash

[sadiqkhoja]

Related forum post: https://forum.getodk.org/t/how-to-add-multiple-language-labels-in-csv-files-for-select-one-type-and-search/45685/3

If appearance value is "search('file.csv') columns-2" then Central is unable to detect that 'file.csv' is expected Form attachment, hence attachment tab doesn't appear.

Sample Form: Search_and_select.xlsx

Failing unit test:

it('should detect primitive search() appearances', () => {
      const xml = `
        <?xml version="1.0"?>
        <h:html xmlns="http://www.w3.org/2002/xforms" xmlns:h="http://www.w3.org/1999/xhtml" xmlns:ev="http://www.w3.org/2001/xml-events" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:jr="http://openrosa.org/javarosa">
          <h:head>
            <model/>
          </h:head>
          <h:body>
            <select1 appearance="columns-2 search('filesix.csv')"/>
          </h:body>
        </h:html>`;
      return expectedFormAttachments(xml).then((attachments) => {
        attachments.should.eql([
          { type: 'file', name: 'filesix.csv' },
        ]);
      });
    });

I originally thought that it's pyxform issue but it is Central that determines the list of attachment for a Form. I think this is something that Central can offload to Web Form engine.