Add focus workspace command

docs/userguide

@@ -2397,6 +2397,9 @@ available:
 <criteria>::
     Sets focus to the container that matches the specified criteria.
     See <<command_criteria>>.
+workspace::
+    Sets focus to the workspace that contains the container that matches the
+    specified criteria.
 left|right|up|down::
         Sets focus to the nearest container in the given direction.
 parent::
@@ -2423,6 +2426,7 @@ output::
 *Syntax*:
 ----------------------------------------------
 <criteria> focus
+<criteria> focus workspace
 focus left|right|down|up
 focus parent|child|floating|tiling|mode_toggle
 focus next|prev [sibling]
@@ -2434,6 +2438,10 @@ focus output left|right|down|up|current|primary|nonprimary|next|<output1> [outpu
 # Focus firefox
 bindsym $mod+F1 [class="Firefox"] focus
 
+# Focus the workspace where firefox is, without necessarily focusing firefox
+# itself.
+bindsym $mod+x [class="Firefox"] focus workspace
+
 # Focus container on the left, bottom, top, right
 bindsym $mod+j focus left
 bindsym $mod+k focus down
@@ -2462,7 +2470,7 @@ bindsym $mod+x focus output primary
 bindsym $mod+x focus output nonprimary
 
 # Cycle focus between outputs VGA1 and LVDS1 but not DVI0
-bindsym $mod+x move workspace to output VGA1 LVDS1
+bindsym $mod+x focus output VGA1 LVDS1
 -------------------------------------------------
 
 Note that you might not have a primary output configured yet. To do so, run: