[FIX] web: several minor issues with editable list

- correctly update the pager when a record is added or removed
- destroy the widgets of the removed row when the user clicks on
  'Cancel' when creating a new record
- ensure that the list always contains 4 rows (before this rev.,
  in list views with less than 4 records,   if the user created a
  new record, then clicked on 'Discard', there were only 3 rows
  left
- properly destroy field widgets when removed from the DOM

Note that the change of parent.parentID to parent.static is not a
bug fix, but it's better to use the key that indicates the type of
list element, instead of implying it from other attributes.

4 files changed, 30 insertions, 14 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_model.js b/addons/web/static/src/js/views/basic/basic_model.js
index 965237e1df1..276fd4df82b 100644
--- a/addons/web/static/src/js/views/basic/basic_model.js
+++ b/addons/web/static/src/js/views/basic/basic_model.js
@@ -769,7 +769,7 @@ var BasicModel = AbstractModel.extend({
     removeLine: function (elementID) {
         var record = this.localData[elementID];
         var parent = this.localData[record.parentID];
-        if (parent.parentID) {
+        if (parent.static) {
             // x2Many case: the new record has been stored in _changes, as a
             // command so we remove the command(s) related to that record
             parent._changes = _.filter(parent._changes, function (change) {
@@ -778,6 +778,7 @@ var BasicModel = AbstractModel.extend({
         } else {
             // main list view case: the new record is in data
             parent.data = _.without(parent.data, elementID);
+            parent.count--;
         }
     },
     /**
diff --git a/addons/web/static/src/js/views/basic/basic_renderer.js b/addons/web/static/src/js/views/basic/basic_renderer.js
index ee6e685c3d4..24922622a42 100644
--- a/addons/web/static/src/js/views/basic/basic_renderer.js
+++ b/addons/web/static/src/js/views/basic/basic_renderer.js
@@ -288,18 +288,18 @@ var BasicRenderer = AbstractRenderer.extend({
      * from internal referencing.
      *
      * @private
-     * @param {Object} record
+     * @param {string} recordID id of the local resource
      * @param {AbstractField} widget
      * @returns {integer} the index of the removed widget
      */
-    _destroyFieldWidget: function (record, widget) {
-        var recordWidgets = this.allFieldWidgets[record.id];
+    _destroyFieldWidget: function (recordID, widget) {
+        var recordWidgets = this.allFieldWidgets[recordID];
         var index = recordWidgets.indexOf(widget);
         if (index >= 0) {
             recordWidgets.splice(index, 1);
         }
-        this._unregisterModifiersElement(widget.__node, record, widget);
-        widget.$el.destroy();
+        this._unregisterModifiersElement(widget.__node, recordID, widget);
+        widget.destroy();
         return index;
     },
     /**
@@ -594,7 +594,7 @@ var BasicRenderer = AbstractRenderer.extend({
         widget.$el.replaceWith(newWidget.$el);
 
         // Destroy the old widget and position the new one at the old one's
-        var oldIndex = this._destroyFieldWidget(record, widget);
+        var oldIndex = this._destroyFieldWidget(record.id, widget);
         var recordWidgets = this.allFieldWidgets[record.id];
         recordWidgets.splice(oldIndex, 0, newWidget);
         recordWidgets.pop();
@@ -606,13 +606,13 @@ var BasicRenderer = AbstractRenderer.extend({
      * node and record.
      *
      * @param {Object} node
-     * @param {Object} record
+     * @param {string} recordID id of the local resource
      * @param {jQuery|AbstractField} element
      */
-    _unregisterModifiersElement: function (node, record, element) {
+    _unregisterModifiersElement: function (node, recordID, element) {
         var modifiersData = this._getModifiersData(node);
         if (modifiersData) {
-            var elements = modifiersData.elementsByRecord[record.id];
+            var elements = modifiersData.elementsByRecord[recordID];
             var index = _.findIndex(elements, function (oldElement) {
                 return oldElement.widget === element
                     || oldElement.$el[0] === element[0];
diff --git a/addons/web/static/src/js/views/list/list_controller.js b/addons/web/static/src/js/views/list/list_controller.js
index 7222d792c69..460ad5de100 100644
--- a/addons/web/static/src/js/views/list/list_controller.js
+++ b/addons/web/static/src/js/views/list/list_controller.js
@@ -182,6 +182,7 @@ var ListController = BasicController.extend({
         if ((recordID || this.handle) !== this.handle) {
             var state = this.model.get(this.handle);
             this.renderer.removeLine(state, recordID);
+            this._updatePager();
         }
     },
     /**
@@ -202,6 +203,7 @@ var ListController = BasicController.extend({
             var state = self.model.get(self.handle);
             self.renderer.updateState(state, {});
             self.renderer.editRecord(recordID);
+            self._updatePager();
         }).always(this._enableButtons.bind(this));
     },
     /**
diff --git a/addons/web/static/src/js/views/list/list_editable_renderer.js b/addons/web/static/src/js/views/list/list_editable_renderer.js
index 8379ab3a891..31d8154f3c1 100644
--- a/addons/web/static/src/js/views/list/list_editable_renderer.js
+++ b/addons/web/static/src/js/views/list/list_editable_renderer.js
@@ -186,6 +186,7 @@ ListRenderer.include({
      * @param {string} recordID
      */
     removeLine: function (state, recordID) {
+        var self = this;
         var rowIndex = _.findIndex(this.state.data, {id: recordID});
         this.state = state;
         if (rowIndex === -1) {
@@ -194,8 +195,20 @@ ListRenderer.include({
         if (rowIndex === this.currentRow) {
             this.currentRow = null;
         }
+
+        // remove the row
         var $row = this.$('.o_data_row:nth(' + rowIndex + ')');
-        $row.remove();
+        if (this.state.count >= 4) {
+            $row.remove();
+        } else {
+            $row.replaceWith(this._renderEmptyRow());
+        }
+
+        // destroy the removed row's widgets
+        var widgetsToDestroy = this.allFieldWidgets[recordID].slice();
+        _.each(widgetsToDestroy, function (widget) {
+            self._destroyFieldWidget(recordID, widget);
+        });
     },
     /**
      * Updates the already rendered row associated to the given recordID so that
@@ -274,7 +287,7 @@ ListRenderer.include({
             // destroyed. This is not the case for simple buttons so we have to
             // do it here.
             if ($td.hasClass('o_list_button')) {
-                self._unregisterModifiersElement(node, record, $td.children());
+                self._unregisterModifiersElement(node, recordID, $td.children());
             }
 
             // For edit mode we only replace the content of the cell with its
@@ -284,14 +297,14 @@ ListRenderer.include({
             if (editMode) {
                 $td.empty().append($newTd.contents());
             } else {
-                self._unregisterModifiersElement(node, record, $td);
+                self._unregisterModifiersElement(node, recordID, $td);
                 $td.replaceWith($newTd);
             }
         });
         delete this.defs;
 
         // Destroy old field widgets
-        _.each(oldWidgets, this._destroyFieldWidget.bind(this, record));
+        _.each(oldWidgets, this._destroyFieldWidget.bind(this, recordID));
 
         // Toggle selected class here so that style is applied at the end
         $row.toggleClass('o_selected_row', editMode);