rc.lua: Revert moving the sloppy focus to awful.permissions.

This caused a behavior change it wasn't clear how to use the
permission API to change the focus mode.

The change will only take effect if the user override the API
level.

awesomerc.lua

@@ -538,3 +538,8 @@ client.connect_signal("request::titlebars", function(c)
     }
 end)
 -- }}}
+
+-- Enable sloppy focus, so that focus follows mouse.
+client.connect_signal("mouse::enter", function(c)
+    c:activate { context = "mouse_enter", raise = false }
+end)

lib/awful/autofocus.lua

@@ -8,8 +8,11 @@
 ---------------------------------------------------------------------------
 require("awful.permissions._common")._deprecated_autofocus_in_use()
 
---require("gears.debug").deprecate(
---    "The `awful.autofocus` module is deprecated, remove the require() and "..
---    "look at the new `rc.lua` granted permission section in the client rules",
---    {deprecated_in=5}
---)
+if awesome.api_level > 4 then
+    --TODO v5: Remove `require("awful.autofocus")` from `rc.lua`.
+    require("gears.debug").deprecate(
+        "The `awful.autofocus` module is deprecated, remove the require() and "..
+        "look at the new `rc.lua` granted permission section in the client rules",
+        {deprecated_in=5}
+    )
+end

lib/awful/permissions/init.lua

@@ -740,9 +740,14 @@ screen.connect_signal("property::workarea", function(s)
 end)
 
 -- Enable sloppy focus, so that focus follows mouse.
-client.connect_signal("mouse::enter", function(c)
-    c:emit_signal("request::autoactivate", "mouse_enter", {raise=false})
-end)
+if awesome.api_level > 4 then
+    --TODO v5: Remove the code from `rc.lua`. It cannot be done yet because we
+    -- cannot know if the user removed it to disable sloppy focus or because
+    -- they want to use the permissions to manage it.
+    client.connect_signal("mouse::enter", function(c)
+        c:emit_signal("request::autoactivate", "mouse_enter", {raise=false})
+    end)
+end
 
 return permissions
 

spec/awful/permissions_spec.lua

@@ -15,6 +15,7 @@ describe("awful.permissions.client_geometry_requests", function()
         connect_signal = function() end,
     }
     _G.awesome = {
+        api_level      = 4,
         connect_signal = function() end,
     }
     _G.drawin = {