Hide and Show WIP items in gitlab. **Install Grease or Tampermonkey**. Click the RAW version of the script and it'll redirect to Tamper-/Greasemonkey

toggleWipGitlab.user.js

// ==UserScript==
// @name         Hide WIP on GitLab
// @namespace
// @version      0.2
// @description  Dont show WIP in merge requests on GitLab
// @author       Alber70g
// @include        /.*gitlab.*\/merge_requests/
// @grant        none
// @updateURL    https://gist.github.com/Alber70g/efe0839dd748df153dc8186c780f4751/raw/toggleWipGitlab.user.js
// ==/UserScript==

(function() {
    'use strict';
    var shown = true;
    function toggleWip() {
        var allLi = Array.from(document.querySelectorAll(".mr-list > li"));
        var listWips = allLi.filter(x => { return (x.textContent.toLocaleLowerCase().split("wip").length > 1); });
        var listNonWips = allLi.filter(x => { return (x.textContent.toLocaleLowerCase().split("wip").length <= 1); });
        listNonWips.forEach(x => { x.style.backgroundColor = 'lightyellow'; });
        var hiddenMessage = document.getElementById('hiddenMessage');

        if (!shown) {
            shown = true;
            listWips.forEach(x => { x.style.display = 'block'; });
        } else {
            shown = false;
            listWips.forEach(x => { x.style.display = 'none'; });
        }
    }

    var message = document.createElement('h5');
    message.setAttribute('id', 'hiddenMessage');
    message.style.color = 'orange';
    message.style.userSelect = 'none';
    message.innerText = 'Click to show/hide WIP';
    message.addEventListener('click', toggleWip);
    document.querySelector(".mr-list").prepend(message);

    function onHref(substring) {
        if (location.href.split(substring).length <= 1) {
            alert('not on ' + substring + ': ' + location.href);
            return false;
        } else {
            return true;
        }
    }

    toggleWip();
})();