naviframe: Override resize_object_set

This is a first step into allowing me to removing the sub_obj argument.
Make elm_widget resize_object a protected property.

See also D265

Ref T5363

src/lib/elementary/elc_naviframe.c

@@ -5,6 +5,7 @@
 #define ELM_INTERFACE_ATSPI_ACCESSIBLE_PROTECTED
 #define ELM_INTERFACE_ATSPI_WIDGET_ACTION_PROTECTED
 #define ELM_WIDGET_ITEM_PROTECTED
+#define ELM_WIDGET_PROTECTED
 
 #include <Elementary.h>
 #include "elm_priv.h"
@@ -57,6 +58,25 @@ static const Elm_Action key_actions[] = {
    {NULL, NULL}
 };
 
+EOLIAN static void
+_elm_naviframe_elm_widget_resize_object_set(Eo *obj, Elm_Naviframe_Data *pd EINA_UNUSED,
+                                            Efl_Canvas_Object *sobj, Eina_Bool sub_obj)
+{
+   if (!sobj || !efl_finalized_get(obj)) goto super;
+   EINA_SAFETY_ON_TRUE_RETURN(sub_obj);
+   ELM_WIDGET_DATA_GET_OR_RETURN(obj, wd);
+
+   if (wd->resize_obj == sobj) return;
+
+   // Detach the previous page as resize object to avoid any modifications to
+   // it by the widget implementation. This preserves clip, smart membership,
+   // focus, etc...
+   wd->resize_obj = NULL;
+
+super:
+   elm_obj_widget_resize_object_set(efl_super(obj, MY_CLASS), sobj, EINA_TRUE);
+}
+
 static void
 _resize_object_reset(Evas_Object *obj, Elm_Naviframe_Item_Data *it)
 {

src/lib/elementary/elm_naviframe.eo

@@ -154,6 +154,7 @@ class Elm.Naviframe (Efl.Ui.Layout, Elm.Interface.Atspi_Widget_Action)
       Elm.Widget.widget_event;
       Efl.Canvas.Layout_Signal.signal_emit;
       Elm.Interface.Atspi_Widget_Action.elm_actions { get; }
+      Elm.Widget.resize_object { set; }
       Efl.Part.part;
    }
    events {

src/lib/elementary/elm_widget.eo

@@ -39,6 +39,23 @@ abstract Elm.Widget (Efl.Canvas.Group, Elm.Interface.Atspi_Accessible,
    event_prefix: elm_widget;
    data: Elm_Widget_Smart_Data;
    methods {
+      @property resize_object @protected {
+         [[This is the internal canvas object managed by a widget.
+
+           This property is protected as it is meant for widget implementations
+           only, to set and access the internal canvas object. Do use this
+           function unless you're implementing a widget.
+         ]]
+         set {
+            [[Sets the new resize object for this widget.]]
+         }
+         values {
+            sobj: Efl.Canvas.Object @nullable;
+               [[A canvas object (often a $Efl.Canvas.Layout object).]]
+            sub_obj: bool; [[$true if sub object exists, $false otherwise]]
+         }
+      }
+
       @property focus {
       	 [[Focus property]]
          values {
@@ -241,15 +258,6 @@ abstract Elm.Widget (Efl.Canvas.Group, Elm.Interface.Atspi_Accessible,
             rotation: int; [[Orientation]]
          }
       }
-      @property resize_object {
-      	 [[Resize object property]]
-         set {
-         }
-         values {
-            sobj: Efl.Canvas.Object @nullable; [[Object]]
-            sub_obj: bool; [[$true if sub object exists, $false otherwise]]
-         }
-      }
       @property domain_translatable_part_text {
       	 [[Domain translatable text part property]]
          set {