[REF] web: FormRenderer: INNER/OUTER_GROUP_COL params

This rev. extracts two rendering parameters for the groups
corresponding to the default col value to apply (for inner and for
outer groups). This allows to easily override those default values
in extentions of the FormRenderer (for instance, in the renderer
of the new Dashboard view).

addons/web/static/src/js/views/form/form_renderer.js

@@ -15,6 +15,10 @@ var FormRenderer = BasicRenderer.extend({
         'click .o_notification_box .oe_field_translate': '_onTranslate',
         'click .oe_title, .o_inner_group': '_onClick',
     }),
+    // default col attributes for the rendering of groups
+    INNER_GROUP_COL: 2,
+    OUTER_GROUP_COL: 2,
+
     /**
      * @override
      */
@@ -387,7 +391,7 @@ var FormRenderer = BasicRenderer.extend({
         this._handleAttributes($result, node);
         this._registerModifiers(node, this.state, $result);
 
-        var col = parseInt(node.attrs.col, 10) || 2;
+        var col = parseInt(node.attrs.col, 10) || this.INNER_GROUP_COL;
 
         if (node.attrs.string) {
             var $sep = $('<tr><td colspan="' + col + '" style="width: 100%;"><div class="o_horizontal_separator">' + node.attrs.string + '</div></td></tr>');
@@ -511,7 +515,8 @@ var FormRenderer = BasicRenderer.extend({
     _renderOuterGroup: function (node) {
         var self = this;
         var $result = $('<div/>', {class: 'o_group'});
-        var colSize = Math.max(1, Math.round(12 / (parseInt(node.attrs.col, 10) || 2)));
+        var nbCols = parseInt(node.attrs.col, 10) || this.OUTER_GROUP_COL;
+        var colSize = Math.max(1, Math.round(12 / nbCols));
         if (node.attrs.string) {
             var $sep = $('<div/>', {class: 'o_horizontal_separator'}).text(node.attrs.string);
             $result.append($sep);