awful.menu: always enable keyboard navigation

I don't see why people would not want keyboard-enabled-menu by default.
Without it, you can't even use 'Escape' to quit the menu or press 'Enter' to
execute an entry.  But instead of just enabling keyboard support by default, we
remove the option of disabling keyboard support altogether, which also
simplifies the implementation a bit.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Signed-off-by: Uli Schlachter <psychon@znc.in>

awesomerc.lua.in

@@ -210,7 +210,7 @@ globalkeys = awful.util.table.join(
             awful.client.focus.byidx(-1)
             if client.focus then client.focus:raise() end
         end),
-    awful.key({ modkey,           }, "w", function () mymainmenu:show({keygrabber=true}) end),
+    awful.key({ modkey,           }, "w", function () mymainmenu:show() end),
 
     -- Layout manipulation
     awful.key({ modkey, "Shift"   }, "j", function () awful.client.swap.byidx(  1)    end),

lib/awful/menu.lua.in

@@ -316,26 +316,16 @@ end
 
 --- Show a menu.
 -- @param menu The menu to show.
--- @param args.keygrabber A boolean enabling or not the keyboard navigation.
 -- @param args.coords Menu position defaulting to mouse.coords()
 function show(menu, args)
     args = args or {}
     local coords = args.coords or nil
     local screen_index = capi.mouse.screen
-    local keygrabber = args.keygrabber or false
 
     if not set_size(menu) then return end
     set_coords(menu, screen_index, coords)
 
-    if menu.parent then
-        menu.keygrabber = menu.parent.keygrabber
-    elseif keygrabber ~= nil then
-        menu.keygrabber = keygrabber
-    else
-        menu.keygrabber = false
-    end
-
-    if not cur_menu and menu.keygrabber then
+    if not cur_menu then
         capi.keygrabber.run(grabber)
     end
     cur_menu = menu
@@ -358,7 +348,7 @@ function hide(menu)
     if cur_menu == menu then
         cur_menu = cur_menu.parent
     end
-    if not cur_menu and menu.keygrabber then
+    if not cur_menu then
         capi.keygrabber.stop()
     end
     menu.wibox.visible = false
@@ -366,7 +356,6 @@ end
 
 --- Toggle menu visibility.
 -- @param menu The menu to show if it's hidden, or to hide if it's shown.
--- @param args.keygrabber A boolean enabling or not the keyboard navigation.
 -- @param args.coords Menu position {x,y}
 function toggle(menu, args)
     if menu.wibox.visible then
@@ -380,9 +369,7 @@ end
 -- @param menu The mnenu to update.
 function update(menu)
     if menu.wibox.visible then
-        menu:show({
-            keygrabber = menu.keygrabber,
-            coords = { x = menu.x, y = menu.y } })
+        menu:show({ coords = { x = menu.x, y = menu.y } })
     end
 end
 
@@ -488,7 +475,6 @@ end
 
 --- Build a popup menu with running clients and shows it.
 -- @param menu Menu table, see new() function for more informations
--- @param args.keygrabber A boolean enabling or not the keyboard navigation.
 -- @return The menu.
 function clients(menu, args) -- FIXME crude api
     menu = menu or {}
@@ -644,9 +630,7 @@ end
 -- &nbsp;&nbsp;&nbsp;          }                                           <br/>
 -- &nbsp;&nbsp;            end                                             <br/>
 -- &nbsp;                end                                               <br/>
--- &nbsp;                m = awful.menu(terms)                             <br/>
--- &nbsp;                m:show({keygrabber=true})                         <br/>
--- &nbsp;                return m                                          <br/>
+-- &nbsp;                awful.menu(terms):show()                          <br/>
 --                     end                                                 <br/>
 --</code></p>
 function new(args, parent)