Merge pull request #474 from blueyed/ewmh-activate-only-focus-visible

ewmh.activate: only focus visible clients

lib/awful/ewmh.lua

@@ -160,7 +160,9 @@ end
 -- @tparam[opt] table hints A table with additional hints:
 -- @tparam[opt=false] boolean hints.raise should the client be raised?
 function ewmh.activate(c, context, hints)
+    if c:isvisible() then
         client.focus = c
+    end
     if hints and hints.raise then
         if awesome.startup or c:isvisible() then
             c:raise()