code: def set_signed_in(self, me):
          
          self.me = me
          self.sign_in_label.configure(text='Signed in')
          self.sign_in_entry.configure(state=tkinter.NORMAL)
          self.sign_in_entry.delete(0, tkinter.END)
          self.sign_in_entry.insert(tkinter.INSERT, utils.get_display_name(me))
          self.sign_in_entry.configure(state=tkinter.DISABLED)
          self.sign_in_button.configure(text='Log out')
          self.chat.focus()
docs: Configures the application as "signed in" (displays user's
          name and disables the entry to input phone/bot token/code).