[IMP] we don't need data-x and data-y on the input

web_widget_x2many_2d_matrix/static/src/xml/web_widget_x2many_2d_matrix.xml

@@ -14,9 +14,9 @@
                 <tbody>
                     <tr t-foreach="widget.get_y_axis_values()" t-as="y" t-att-data-y="y">
                         <th><t t-esc="widget.get_y_axis_label(y)" /></th>
-                        <td t-foreach="widget.get_x_axis_values()" t-as="x" t-att-class="'oe_list_field_cell' + (widget.is_numeric ? ' oe_number' : '')">
+                        <td t-foreach="widget.get_x_axis_values()" t-as="x" t-att-class="'oe_list_field_cell' + (widget.is_numeric ? ' oe_number' : '')" t-att-data-x="x">
                             <span t-att-class="widget.get_xy_value_class()">
-                                <input style="display: none" t-att-data-x="x" t-att-data-y="y" t-att-data-id="widget.get_xy_id(x, y)" t-att-value="widget.format_xy_value(widget.get_xy_value(x, y))" />
+                                <input style="display: none" t-att-data-id="widget.get_xy_id(x, y)" t-att-value="widget.format_xy_value(widget.get_xy_value(x, y))" />
                                 <span style="display: none"><t t-esc="widget.format_xy_value(widget.get_xy_value(x, y))" /></span>
                             </span>
                         </td>