[REF] web_kanban: allow a custom limit defined in the arch

With this commit, it's now possible to set an arbitrary limit on any
kanban view by adding a limit attribut to the root kanban tag in a
kanban definition.

Do not forward-port.

Backport of rev 8a87c382ba

addons/web_kanban/static/src/js/kanban_view.js

@@ -66,7 +66,7 @@ var KanbanView = View.extend({
         this.qweb.default_dict = _.clone(QWeb.default_dict);
 
         this.model = this.dataset.model;
-        this.limit = options.limit || 40;
+        this.limit = options.limit;
         this.grouped = undefined;
         this.group_by_field = undefined;
         this.default_group_by = undefined;
@@ -84,6 +84,10 @@ var KanbanView = View.extend({
     },
 
     view_loading: function(fvg) {
+        if (!this.limit) {
+            this.limit = parseInt(fvg.arch.attrs.limit, 10) || 40;
+        }
+
         this.$el.addClass(fvg.arch.attrs.class);
         this.fields_view = fvg;
         this.default_group_by = fvg.arch.attrs.default_group_by;