[FIX] web: control panel load/save filter sort param

Before this commit, the wrong semantics was implemented in the webclient
concerning the "sort" char field in ir.filter
Loading a filter with a sort with negative order made the webclient crash

This field holds a JSON string, representing a list of field names
If the order of the field is inverse, there should be a "-" before it
for legacy purposes

After this commit, the semantics have changed for consistency
that is, at save time the sql notation is preferred
We support the legacy notation too for backward compatibility

closes odoo/odoo#31102

addons/web/static/src/js/views/control_panel/control_panel_model.js

@@ -927,10 +927,21 @@ var ControlPanelModel = mvc.Model.extend({
                     }
                     var sort = JSON.parse(favorite.sort);
                     var orderedBy = sort.map(function (order) {
-                        var orderTerms = order.split(' ');
+                        var fieldName;
+                        var asc;
+                        var sqlNotation = order.split(' ');
+                        if (sqlNotation.length > 1) {
+                            // regex: \fieldName (asc|desc)?\
+                            fieldName = sqlNotation[0];
+                            asc = sqlNotation[1] === 'asc';
+                        } else {
+                            // legacy notation -- regex: \-?fieldName\
+                            fieldName = order[0] === '-' ? order.slice(1) : order;
+                            asc = order[0] === '-' ? false : true;
+                        }
                         return {
-                            name: orderTerms[0],
-                            asc: orderTerms.length === 2 && orderTerms[1] === 'asc',
+                            name: fieldName,
+                            asc: asc,
                         };
                     });
                     return {

addons/web/static/tests/views/control_panel_tests.js

@@ -392,5 +392,86 @@ QUnit.module('Views', {
 
         controlPanel.destroy();
     });
+
+    QUnit.test('load filter', async function (assert) {
+        assert.expect(1);
+
+        var controlPanel = await createControlPanel({
+            model: 'partner',
+            arch: "<search></search>",
+            data: this.data,
+            searchMenuTypes: ['filter'],
+            intercepts: {
+                load_filters: function (ev) {
+                    ev.data.on_success([
+                        {
+                            user_id: [2,"Mitchell Admin"],
+                            name: 'sorted filter',
+                            id: 5,
+                            context: {},
+                            sort: "[\"foo\", \"-bar\"]",
+                            domain: "[('user_id', '=', uid)]",
+                        }
+                    ]);
+                }
+            }
+        });
+
+         _.each(controlPanel.exportState().filters, function (filter) {
+            if (filter.type === 'favorite') {
+                assert.deepEqual(filter.orderedBy, 
+                    [{
+                        name: 'foo',
+                        asc: true,
+                    }, {
+                        name: 'bar',
+                        asc: false,
+                    }],
+                    'the filter should have the right orderedBy values');
+            }
+        });
+
+        controlPanel.destroy();
+    });
+
+    QUnit.test('save filter', async function (assert) {
+        assert.expect(1);
+
+        var controlPanel = await createControlPanel({
+            model: 'partner',
+            arch: "<search></search>",
+            data: this.data,
+            searchMenuTypes: ['filter'],
+            intercepts: {
+                create_filter: function (ev) {
+                    assert.strictEqual(ev.data.filter.sort, "[\"foo\",\"bar desc\"]",
+                        'The right format for the string "sort" should be sent to the server');
+                },
+                get_controller_query_params: function (ev) {
+                    ev.data.callback({
+                        orderedBy: [
+                            {
+                                name: 'foo',
+                                asc: true,
+                            }, {
+                                name: 'bar',
+                                asc: false,
+                            }
+                        ]
+                    });
+                }
+            }
+        });
+
+        controlPanel._onNewFavorite({
+            data: {
+                description: 'Morbier',
+                type: 'favorite',
+            },
+            stopPropagation: function () {return;}
+        });
+
+        controlPanel.destroy();
+    });
 });
 });