Always update state of delete and undelete buttons in window form

Closes #13323
(grafted from 377fcba9fba2d39973067915f72848fd01bce7ed)

--HG--
branch : 6.0

sao/src/window.js

@@ -354,10 +354,12 @@
                 }
                 this.but_next.prop('disabled', data[0] >= data[1]);
                 this.but_previous.prop('disabled', data[0] <= 1);
-                if (access.delete && !readonly && deletable) {
-                    this.but_del.prop('disabled', false);
-                    this.but_undel.prop('disabled', false);
-                }
+                this.but_del.prop(
+                    'disabled',
+                    readonly ||
+                    !access.delete ||
+                    !deletable);
+                this.but_undel.prop('disabled', readonly);
             } else {
                 this.but_del.prop('disabled', true);
                 this.but_undel.prop('disabled', true);

tryton/tryton/gui/window/win_form.py

@@ -368,9 +368,11 @@ class WinForm(NoModal, InfoBar):
                 self.but_pre.set_sensitive(True)
             else:
                 self.but_pre.set_sensitive(False)
-            if access['delete'] and not readonly and deletable:
-                self.but_del.set_sensitive(True)
-                self.but_undel.set_sensitive(True)
+            self.but_del.set_sensitive(bool(
+                    not readonly
+                    and access['delete']
+                    and deletable))
+            self.but_undel.set_sensitive(bool(not readonly))
         else:
             self.but_del.set_sensitive(False)
             self.but_undel.set_sensitive(False)