Add alt-tab switching for all desktops.

Summary:
Add Alt-Tab to switch between all applications on all
desktops. T128

Test Plan:
Verify Alt-Tab switches between applications even if they
exist on multiple desktops.

Reviewers: wxl, tsimonq2

Reviewed By: wxl

Subscribers: EinarMostad

Differential Revision: https://phab.lubuntu.me/D84

debian/changelog

@@ -1,3 +1,9 @@
+lubuntu-default-settings (20.04.4) focal; urgency=medium
+
+  * Add alt-tab switching for all desktops. Thanks to Einar Mostad.
+
+ -- Dan Simmons <kc2bez@lubuntu.me>  Tue, 18 Feb 2020 19:59:55 -0500
+
 lubuntu-default-settings (20.04.3) focal; urgency=medium
 
   * Added nm-tray.conf in xdg for connection-editor

src/etc/xdg/xdg-Lubuntu/openbox/lxqt-rc.xml

@@ -248,6 +248,7 @@
         <action name="Raise"/>
         <action name="Unshade"/>
       </finalactions>
+      <allDesktops>yes</allDesktops>
     </action>
   </keybind>
   <keybind key="A-S-Tab">
@@ -257,6 +258,7 @@
         <action name="Raise"/>
         <action name="Unshade"/>
       </finalactions>
+      <allDesktops>yes</allDesktops>
     </action>
   </keybind>