Function fill

src/components/fx/hover.js:2179–2182

(key, calcKey, traceKey)

          };

    function fill(key, calcKey, traceKey) {
        var val = getVal(calcKey, traceKey);
        if (pass(val)) d[key] = val;
    }

    fill('hoverinfo', 'hi', 'hoverinfo');
    fill('bgcolor', 'hbg', 'hoverlabel.bgcolor');