diff --git a/addons/mail/wizard/mail_compose_message.py b/addons/mail/wizard/mail_compose_message.py
index cef6496c35203c92e5cf57bcd434b6a23a41be94..1ee7104dc8dc9791b09e3278a3d8926a35338733 100644
--- a/addons/mail/wizard/mail_compose_message.py
+++ b/addons/mail/wizard/mail_compose_message.py
@@ -353,7 +353,6 @@ class MailComposer(models.TransientModel):
             - normal mode: return rendered values
             /!\ for x2many field, this onchange return command instead of ids
         """
-        attachment_ids = []
         if template_id and composition_mode == 'mass_mail':
             template = self.env['mail.template'].browse(template_id)
             fields = ['subject', 'body_html', 'email_from', 'reply_to', 'mail_server_id']
@@ -369,6 +368,7 @@ class MailComposer(models.TransientModel):
             values = self.generate_email_for_composer(template_id, [res_id])[res_id]
             # transform attachments into attachment_ids; not attached to the document because this will
             # be done further in the posting process, allowing to clean database if email not send
+            attachment_ids = []
             Attachment = self.env['ir.attachment']
             for attach_fname, attach_datas in values.pop('attachments', []):
                 data_attach = {
@@ -380,6 +380,8 @@ class MailComposer(models.TransientModel):
                     'type': 'binary',  # override default_type from context, possibly meant for another model!
                 }
                 attachment_ids.append(Attachment.create(data_attach).id)
+            if values.get('attachment_ids', []) or attachment_ids:
+                values['attachment_ids'] = [(5,)] + values.get('attachment_ids', []) + attachment_ids
         else:
             default_values = self.with_context(default_composition_mode=composition_mode, default_model=model, default_res_id=res_id).default_get(['composition_mode', 'model', 'res_id', 'parent_id', 'partner_ids', 'subject', 'body', 'email_from', 'reply_to', 'attachment_ids', 'mail_server_id'])
             values = dict((key, default_values[key]) for key in ['subject', 'body', 'partner_ids', 'email_from', 'reply_to', 'attachment_ids', 'mail_server_id'] if key in default_values)
@@ -391,10 +393,7 @@ class MailComposer(models.TransientModel):
         # ORM handle the assignation of command list on new onchange (api.v8),
         # this force the complete replacement of x2many field with
         # command and is compatible with onchange api.v7
-        attachment_ids += values.pop('attachment_ids' , [])
         values = self._convert_to_write(values)
-        if attachment_ids:
-            values.update(attachment_ids=[(6, 0, attachment_ids)])
 
         return {'value': values}
 
diff --git a/addons/test_mail/tests/test_mail_template.py b/addons/test_mail/tests/test_mail_template.py
index 55ddbb7b667aad9a416bb2c687b09f17d8bcbd02..bb4a96470d0bbf8f4fb777eb5ce529c9fad9bcad 100644
--- a/addons/test_mail/tests/test_mail_template.py
+++ b/addons/test_mail/tests/test_mail_template.py
@@ -75,7 +75,7 @@ class TestMailTemplate(BaseFunctionalTest, MockEmails, TestRecipients):
         static attachments are not duplicated and while reports are re-generated,
         and that intermediary attachments are dropped."""
 
-        composer = self.env['mail.compose.message'].create({})
+        composer = self.env['mail.compose.message'].with_context(default_attachment_ids=[]).create({})
         report_template = self.env.ref('web.action_report_externalpreview')
         template_1 = self.email_template.copy({
             'report_template': report_template.id,
@@ -85,20 +85,20 @@ class TestMailTemplate(BaseFunctionalTest, MockEmails, TestRecipients):
             'report_template': report_template.id,
         })
 
-        onchange_templates = [template_1, template_2, template_1]
-        attachments_onchange = []
+        onchange_templates = [template_1, template_2, template_1, False]
+        attachments_onchange = [composer.attachment_ids]
         # template_1 has two static attachments and one dynamically generated report,
         # template_2 only has the report, so we should get 3, 1, 3 attachments
-        attachment_numbers = [3, 1, 3]
+        attachment_numbers = [0, 3, 1, 3, 0]
 
-        for template in onchange_templates:
-            onchange = composer.onchange_template_id(
-                template.id, 'comment', 'mail.test', self.test_record.id
-            )
-            values = composer._convert_to_record(composer._convert_to_cache(onchange['value']))
-            attachments = values['attachment_ids']
-            composer.attachment_ids = attachments  # we apply the onchange
-            attachments_onchange.append(attachments)
+        with self.env.do_in_onchange():
+            for template in onchange_templates:
+                onchange = composer.onchange_template_id(
+                    template.id if template else False, 'comment', self.test_record._name, self.test_record.id
+                )
+                values = composer._convert_to_record(composer._convert_to_cache(onchange['value']))
+                attachments_onchange.append(values['attachment_ids'])
+                composer.update(onchange['value'])
 
         self.assertEqual(
             [len(attachments) for attachments in attachments_onchange],
@@ -106,7 +106,7 @@ class TestMailTemplate(BaseFunctionalTest, MockEmails, TestRecipients):
         )
 
         self.assertTrue(
-            len(attachments_onchange[0] & attachments_onchange[2]) == 2,
+            len(attachments_onchange[1] & attachments_onchange[3]) == 2,
             "The two static attachments on the template should be common to the two onchanges"
         )
 
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 a0ce8d31af4afaa664800cf7e9027e8ae13dc4ea..4b8dd3e1d8832b80ae8fe701108ba270d0c505b8 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
@@ -556,48 +556,48 @@ ListRenderer.include({
     _resequence: function (event, ui) {
         var self = this;
         var movedRecordID = ui.item.data('id');
-        var rows = this.state.data;
-        var row = _.findWhere(rows, {id: movedRecordID});
-        var index0 = rows.indexOf(row);
-        var index1 = ui.item.index();
-        var lower = Math.min(index0, index1);
-        var upper = Math.max(index0, index1) + 1;
-
-        var order = _.findWhere(self.state.orderedBy, {name: self.handleField});
-        var asc = !order || order.asc;
-        var reorderAll = false;
-        var sequence = (asc ? -1 : 1) * Infinity;
-
-        // determine if we need to reorder all lines
-        _.each(rows, function (row, index) {
-            if ((index < lower || index >= upper) &&
-                ((asc && sequence >= row.data[self.handleField]) ||
-                 (!asc && sequence <= row.data[self.handleField]))) {
-                reorderAll = true;
-            }
-            sequence = row.data[self.handleField];
-        });
+        self.unselectRow().then(function () {
+            var rows = self.state.data;
+            var row = _.findWhere(rows, {id: movedRecordID});
+            var index0 = rows.indexOf(row);
+            var index1 = ui.item.index();
+            var lower = Math.min(index0, index1);
+            var upper = Math.max(index0, index1) + 1;
+
+            var order = _.findWhere(self.state.orderedBy, {name: self.handleField});
+            var asc = !order || order.asc;
+            var reorderAll = false;
+            var sequence = (asc ? -1 : 1) * Infinity;
+
+            // determine if we need to reorder all lines
+            _.each(rows, function (row, index) {
+                if ((index < lower || index >= upper) &&
+                    ((asc && sequence >= row.data[self.handleField]) ||
+                     (!asc && sequence <= row.data[self.handleField]))) {
+                    reorderAll = true;
+                }
+                sequence = row.data[self.handleField];
+            });
 
-        if (reorderAll) {
-            rows = _.without(rows, row);
-            rows.splice(index1, 0, row);
-        } else {
-            rows = rows.slice(lower, upper);
-            rows = _.without(rows, row);
-            if (index0 > index1) {
-                rows.unshift(row);
+            if (reorderAll) {
+                rows = _.without(rows, row);
+                rows.splice(index1, 0, row);
             } else {
-                rows.push(row);
+                rows = rows.slice(lower, upper);
+                rows = _.without(rows, row);
+                if (index0 > index1) {
+                    rows.unshift(row);
+                } else {
+                    rows.push(row);
+                }
             }
-        }
 
-        var sequences = _.pluck(_.pluck(rows, 'data'), self.handleField);
-        var rowIDs = _.pluck(rows, 'id');
+            var sequences = _.pluck(_.pluck(rows, 'data'), self.handleField);
+            var rowIDs = _.pluck(rows, 'id');
 
-        if (!asc) {
-            rowIDs.reverse();
-        }
-        this.unselectRow().then(function () {
+            if (!asc) {
+                rowIDs.reverse();
+            }
             self.trigger_up('resequence', {
                 rowIDs: rowIDs,
                 offset: _.min(sequences),
diff --git a/addons/web/static/tests/views/form_tests.js b/addons/web/static/tests/views/form_tests.js
index f0f0da04e9481e580c8ea10ee47370e5e3416fa9..df94fbe106613713b4bfa7ba7929485b9d3df388 100644
--- a/addons/web/static/tests/views/form_tests.js
+++ b/addons/web/static/tests/views/form_tests.js
@@ -7525,6 +7525,68 @@ QUnit.module('Views', {
                      .trigger($.Event('keydown', {which: $.ui.keyCode.ESCAPE}));
         form.destroy();
     });
+
+    QUnit.test('resequence list lines when discardable lines are present', function (assert) {
+        assert.expect(8);
+
+        var onchangeNum = 0;
+
+        this.data.partner.onchanges = {
+            p: function (obj) {
+                onchangeNum++;
+                obj.foo = obj.p.length.toString();
+            },
+        };
+
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form>' +
+                    '<field name="foo"/>' +
+                    '<field name="p"/>' +
+                '</form>',
+            archs: {
+                'partner,false,list':
+                    '<tree editable="bottom">' +
+                        '<field name="int_field" widget="handle"/>' +
+                        '<field name="display_name" required="1"/>' +
+                    '</tree>',
+            },
+        });
+
+        assert.strictEqual(onchangeNum, 1, "one onchange happens when form is opened");
+        assert.strictEqual(form.$('[name="foo"]').val(), "0", "onchange worked there is 0 line");
+
+        // Add one line
+        form.$('.o_field_x2many_list_row_add a').click();
+        form.$('.o_field_one2many input:first').focus();
+        form.$('.o_field_one2many input:first').val('first line').trigger('input');
+        form.$('input[name="foo"]').click();
+        assert.strictEqual(onchangeNum, 2, "one onchange happens when a line is added");
+        assert.strictEqual(form.$('[name="foo"]').val(), "1", "onchange worked there is 1 line");
+
+        // Drag and drop second line before first one (with 1 draft and invalid line)
+        form.$('.o_field_x2many_list_row_add a').click();
+        testUtils.dragAndDrop(
+            form.$('.ui-sortable-handle').eq(0),
+            form.$('.o_data_row').last(),
+            {position: 'bottom'}
+        );
+        assert.strictEqual(onchangeNum, 3, "one onchange happens when lines are resequenced")
+        assert.strictEqual(form.$('[name="foo"]').val(), "1", "onchange worked there is 1 line");
+
+        // Add a second line
+        form.$('.o_field_x2many_list_row_add a').click();
+        form.$('.o_field_one2many input:first').focus();
+        form.$('.o_field_one2many input:first').val('second line').trigger('input');
+        form.$('input[name="foo"]').click();
+        assert.strictEqual(onchangeNum, 4, "one onchange happens when a line is added");
+        assert.strictEqual(form.$('[name="foo"]').val(), "2", "onchange worked there is 2 lines");
+
+        form.destroy();
+    });
+
     QUnit.test('if the focus is on the discard button, hitting ESCAPE should discard', function (assert) {
         assert.expect(1);
 
diff --git a/addons/website_sale_wishlist/static/src/js/website_sale_wishlist.js b/addons/website_sale_wishlist/static/src/js/website_sale_wishlist.js
index 153527096a5f4a1dfaeb9e851ecad7866ec40201..a5dbda94698aea90ca9ea64fa90e8289fb36f22f 100644
--- a/addons/website_sale_wishlist/static/src/js/website_sale_wishlist.js
+++ b/addons/website_sale_wishlist/static/src/js/website_sale_wishlist.js
@@ -138,7 +138,7 @@ var ProductWishlist = Widget.extend({
         // can be hidden if empty
         $('#my_cart').removeClass('hidden');
         website_sale_utils.animate_clone($('#my_cart'), tr, 25, 40);
-        return this.add_to_cart(product, tr.find('qty').val() || 1);
+        return this.add_to_cart(product, tr.find('input[name="add_qty"]').val() || 1);
     },
     wishlist_mv: function(e){
         var tr = $(e.currentTarget).parents('tr');
@@ -146,7 +146,7 @@ var ProductWishlist = Widget.extend({
 
         $('#my_cart').removeClass('hidden');
         website_sale_utils.animate_clone($('#my_cart'), tr, 25, 40);
-        var adding_deffered = this.add_to_cart(product, tr.find('qty').val() || 1);
+        var adding_deffered = this.add_to_cart(product, tr.find('input[name="add_qty"]').val() || 1);
         this.wishlist_rm(e, adding_deffered);
         return adding_deffered;
     },