[FIX] survey, base: show trigger icon immediately

Since the refactoring of the JS relational model (d4fe919d),
the list is not fully re-rendered after field updates,
such that a fixed narrow column width is added at first rendering
if there are no triggers shown on any row, and cannot be updated.

We need to override it by providing a `width`, which was already
a supported attribute but not declared in rng.

Task-3512604

closes odoo/odoo#135895

Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>

addons/survey/views/survey_survey_views.xml

@@ -79,7 +79,7 @@
                                         invisible="not is_page"/>
                                     <field name="triggering_question_ids" column_invisible="True"/>
                                     <field name="triggering_answer_ids" column_invisible="True" widget="many2many_tags"/> <!-- widget to fetch display_name -->
-                                    <widget name="survey_question_trigger"/>
+                                    <widget name="survey_question_trigger" width="30px"/>
                                     <button name="copy" type="object" icon="fa-clone" title="Duplicate Question"/>
                                     <control>
                                         <create name="add_question_control" string="Add a question"/>

odoo/addons/base/rng/common.rng

@@ -412,6 +412,7 @@
         <rng:element name="widget">
             <rng:attribute name="name"/>
             <rng:optional><rng:attribute name="options"/></rng:optional>
+            <rng:optional><rng:attribute name="width"/></rng:optional>
         </rng:element>
     </rng:define>