Brisk menu should allow keyboard-only navigation for buttom left corner items (end session, lock, turn off)

[Norbert]

It seems that it is impossible to access the bottom left corner items of Brisk Menu (*End the current session*, *Lock the screen*, *Turn off the device*):

- see screenshot.

I can't navigate to them using `<Tab>` key. So it seems that such tooltips (or buttons) do not have keybindings / accelerators / shortcuts defined.

Steps to reproduce:
1. Install Ubuntu MATE 18.04.2 LTS with all updates on fresh system.
1. Login to the MATE session
1. Click `<Super>` key to open Brisk menu
1. Click `<Tab>` key to try to access the bottom left corner items of Brisk Menu (*End the current session*, *Lock the screen*, *Turn off the device*).

Expected results:
user is able to navigate to the bottom left corner items by using only keyboard.

Actual results:
user is unable to navigate to the bottom left corner items by using only keyboard.

Link to discussion:
https://ubuntu-mate.community/t/brisk-menu-how-to-access-buttom-left-corner-items-end-session-lock-turn-off-by-using-only-keyboard/19184

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mate-applet-brisk-menu 0.5.0-7ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: MATE
Date: Fri Mar 22 13:37:56 2019
InstallationDate: Installed on 2018-04-26 (329 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: brisk-menu
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

Reported upstream as

https://github.com/solus-project/brisk-menu/issues/117 (deprecated)
https://github.com/getsolus/brisk-menu/issues/8

[Launchpad Janitor (janitor)]

This bug was fixed in the package brisk-menu - 0.6.0-1ubuntu1

---------------
brisk-menu (0.6.0-1ubuntu1) focal; urgency=medium

  [ Mike Gabriel ]
  * debian/control:
    + Add Rules-Requires-Root: field and set it to no.
    + Bump Standards-Version: to 4.5.0. No changes needed.

  [ Martin Wimpress ]
  * debian/patches:
    + Add 1000_fix_crashes_on_menu_rebuild.patch. Hide menu when rebuilding
      menu items. (LP: #1724115)
    + Add 1001_recreate_applet_when_changing_type.patch. Re-create applet menu
      when changing window-type. (LP: #1724262)
    + Add 1002_fix_keyboard_navigation.patch. Allow keyboard navigation.
      (LP: #1821315)

 -- Martin Wimpress <email address hidden> Fri, 10 Apr 2020 22:05:42 +0100