custom.js

(function () {

    let prev = require.getConfig().onError;
    
    // Weird errors in console - at first attempt require is not able to find the
    // packages
    require.getConfig().onError = function (e) {
        if (e.neededBy != "ourModule") {
            prev(e);
        }
    }

    // Override function 'name' on where, invoking cb right before the function returns
    override = function (where, name, cb, processRes) {
        (function (original) {
            where.prototype[name] = function () {
                let res = original.apply(this, arguments);
                if (cb !== undefined)
                    cb.apply(this);
                if (processRes !== undefined)
                    res = processRes.apply(this, [res]);
                return res;
            }
        })(where.prototype[name]);
    }

    require.define("ourModule", [
        "vs/workbench/browser/workbench",
        "vs/workbench/services/window/electron-browser/windowService",
        "vs/base/browser/dom",
    ],
        function (wb, ws, dom) {

            override(wb.Workbench, "startup", undefined, function (r) {
                // Intercept to grab the InstantiationService, we'll need it later to
                // get instance of WindowService
                window.services = r;
                return r;
            });

            let needTitle = true;

            let previousAdd = dom.addDisposableListener;
            dom.addDisposableListener = function (node, type, handler, useCapture) {

                // attach handler to sidebar title
                if (needTitle && document.getElementsByClassName("composite title").length > 0) {
                    document.getElementsByClassName("composite title")[0].addEventListener("dblclick", function () {
                        let windowService = window.services.createInstance(ws.WindowService);
                        windowService.onWindowTitleDoubleClick();
                    });
                    needTitle = false;
                }

                // override handler for tabs container
                if (type == "dblclick" && node.className == 'tabs-container') {
                    handler = function () {
                        let windowService = window.services.createInstance(ws.WindowService);
                        windowService.onWindowTitleDoubleClick();
                    }
                }
                return previousAdd(node, type, handler, useCapture);
            }
        }
    );

})()