KeyboardManager#hasFocus misses valid contenteditable attributes

[mattexdee]

Originally in GitLab by @mattexdee

Originally posted by stwlam (he/him): https://discord.com/channels/170995199584108546/872553750877835264/929081310205595689

• ALL MODULES DISABLED? no
• OS, Hosting, Browser (if applicable): Debian 11, Electron Application
• Short Description of bug: KeyboardManager#hasFocus misses valid contenteditable attributes
• Simple steps to reproduce the bug: Add a tag of or to any UI (equivalent to contenteditable="true" according to https://html.spec.whatwg.org/multipage/interaction.html#attr-contenteditable)
• Screenshots and/or console errors:
• The following will incorrectly return false since neither of the above have an attribute value of the string "true":

   /**
   * Test whether a Form Element currently has focus
   * @return {boolean}
   */
  get hasFocus() {
    // Pulled from https://www.w3schools.com/html/html_form_elements.asp
    const formElements = [ "input", "select", "textarea", "option", "[contentEditable=true]"];
    const selector = formElements.map(el => `${el}:focus`).join(", ");
    return document.querySelectorAll(selector).length > 0;
  }