ement('div');
                    div.className = "file-div";
                    div.onclick = () => { pending = {}; load_source(path); }
                    div.path = path;
                    el_file_tree.appendChild(div);

                    let coverage = document.createElement('span');
                    coverage.className = "file-coverage";
                    if (file.p != undefined) {
                        let red = 1.0 - file.p;
                        let green = file.p;
                    