Add a shortcut to lock the screen (LP: #912499)

debian/changelog

@@ -10,6 +10,7 @@ lubuntu-default-settings (0.23) UNRELEASED; urgency=low
      current window.
    - Add a shortcut for the power button.
    - Use horizontal presentation of the alt-tab.
+   - Add a shortcut to lock the screen (LP: #912499)
   * usr/bin/startlubuntu* & usr/share/lubuntu/xscreensaver/xscreensaver:
    - Add a custom configuration file for xscreensaver, with blank mode by
      default (LP: #578789).

usr/share/lubuntu/openbox/rc.xml

@@ -390,6 +390,12 @@
         <command>pcmanfm</command>
       </action>
     </keybind>
+    <!-- Lock the screen on Ctrl + Alt + l-->
+    <keybind key="C-A-l">
+      <action name="Execute">
+        <command>xscreensaver-command -lock</command>
+      </action>
+    </keybind>
     <!-- Keybinding for Volume management -->
     <keybind key="XF86AudioRaiseVolume">
       <action name="Execute">