def _do_focus(self):
        """
        Focus the window if we can, and return whether or not it was successful.
        """

        # don't focus hidden windows, they should be mapped. this is generally
        # a bug somewhere in the qtile code, but some of the tests do it, so we
        # just have to let it slide for now.
        if self.hidden:
            return False

        # if the window can be focused, just focus it.
        if self.hints["input"]:
            self.window.set_input_focus()
            return True

        # does the window want us to ask it about focus?
        if "WM_TAKE_FOCUS" in self.window.get_wm_protocols():
            data = [
                self.qtile.core.conn.atoms["WM_TAKE_FOCUS"],
                # The timestamp here must be a valid timestamp, not CurrentTime.
                #
                # see https://tronche.com/gui/x/icccm/sec-4.html#s-4.1.7
                # > Windows with the atom WM_TAKE_FOCUS in their WM_PROTOCOLS
                # > property may receive a ClientMessage event from the
                # > window manager (as described in section 4.2.8) with
                # > WM_TAKE_FOCUS in its data[0] field and a valid timestamp
                # > (i.e. not *CurrentTime* ) in its data[1] field.
                self.qtile.core.get_valid_timestamp(),
                0,
                0,
                0,
            ]

            u = xcffib.xproto.ClientMessageData.synthetic(data, "I" * 5)
            e = xcffib.xproto.ClientMessageEvent.synthetic(
                format=32,
                window=self.window.wid,
                type=self.qtile.core.conn.atoms["WM_PROTOCOLS"],
                data=u,
            )

            self.window.send_event(e)
            return True

        # we didn't focus this time. but now the window knows if it wants
        # focus, it should SetFocus() itself; we'll get another notification
        # about this.
        return False

        Focus the window if we can, and return whether or not it was successful.
        
libqtile/backend/x11/window.py