[layout] Improve focus management

layout.lua

@@ -14,7 +14,6 @@
 local BASE = (...):gsub('layout$', '')
 
 local Widget = require(BASE..'widget')
-local core = require(BASE..'core')
 
 local gear = require 'lib.gear'
 
@@ -126,12 +125,21 @@ function Layout:layoutWidgets()
     self.y = ry
     self.w = math.max(rw, 0)
     self.h = math.max(rh, 0)
+
+    -- A Layout ignores focus if empty or containing only nofocus widgets
+    self.nofocus = true
+    for _,w in ipairs(self) do
+        if not w.nofocus then
+            self.nofocus = false
+            break
+        end
+    end
 end
 
 -- Find layout's child containing the provided widget.
 local function childof(layout, widget)
     local parent = widget.parent
-    while parent ~= layout do
+    while not rawequal(parent, layout) do
         widget = parent
         parent = widget.parent
     end
@@ -173,16 +181,6 @@ function Layout:new(args)
 
     self.padding = self.padding or 0
     self.stack = {}
-
-    -- A Layout ignores focus if empty or containing only nofocus widgets
-    self.nofocus = true
-    for _,w in ipairs(self) do
-        if not w.nofocus then
-            self.nofocus = false
-            break
-        end
-    end
-
     return self
 end
 
@@ -201,7 +199,7 @@ function Layout:after(widget)
     widget = childof(self, widget)
 
     for i = 1,#self do
-        if self[i] == widget then
+        if rawequal(self[i], widget) then
             -- Search to the right/down
             return scanforward(self, i+1)
         end
@@ -213,7 +211,7 @@ function Layout:before(widget)
     widget = childof(self, widget)
 
     for i = 1,#self do
-        if self[i] == widget then
+        if rawequal(self[i], widget) then
             -- Search to the left/up
             return scanbackwards(self, i-1)
         end