[FIX] web: allow widget many2many_tags to display more than 40 records

Before this commit, the widget many2many_tags only loaded the first 40
records. This was difficult to see, because there were not so many views
with a lot of tags.

addons/web/static/src/js/views/abstract_view.js

@@ -253,7 +253,8 @@ var AbstractView = Class.extend({
                 return;
             }
 
-            attrs.limit = attrs.mode === "tree" ? 80 : 40;
+            attrs.limit = attrs.mode === "tree" ? 80 :
+                         (attrs.widget === 'many2many_tags' ? 1000 : 40);
 
             if (attrs.Widget.prototype.useSubview && !attrs.__no_fetch && !attrs.views[attrs.mode]) {
                 var context = {};

addons/web/static/tests/fields/relational_fields_tests.js

@@ -7451,6 +7451,29 @@ QUnit.module('relational_fields', {
         form.destroy();
     });
 
+    QUnit.test('many2many_tags can load more than 40 records', function (assert) {
+        assert.expect(1);
+
+        this.data.partner.fields.partner_ids = {string: "Partner", type: "many2many", relation: 'partner'};
+        this.data.partner.records[0].partner_ids = [];
+        for (var i = 15; i < 115; i++) {
+            this.data.partner.records.push({id: i, display_name: 'walter' + i});
+            this.data.partner.records[0].partner_ids.push(i);
+        }
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form string="Partners">' +
+                    '<field name="partner_ids" widget="many2many_tags"/>' +
+                '</form>',
+            res_id: 1,
+        });
+        assert.strictEqual(form.$('.o_field_widget[name="partner_ids"] > span').length, 100,
+            'should have rendered 100 tags');
+        form.destroy();
+    });
+
     QUnit.test('field many2many_tags keeps focus when being edited', function (assert) {
         assert.expect(7);