bug #25233 [TwigBridge][Form] Fix hidden currency element with Bootstrap 3 theme (julienfalque)

This PR was merged into the 2.7 branch.

Discussion
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[TwigBridge][Form] Fix hidden currency element with Bootstrap 3 theme

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

When using a `MoneyType` field, one can pass `currency=false` option to hide the currency symbol. This does not work well when using the Bootstrap 3 theme: the symbol is not displayed but HTML elements that are supposed to contain it are still rendered.

Commits
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c5af7fd938 Fix hidden currency element with Bootstrap 3 theme

Author: fabpot

Resources/views/Form/bootstrap_3_layout.html.twig

@@ -20,16 +20,21 @@
 {%- endblock %}
 
 {% block money_widget -%}
-    <div class="input-group">
-        {% set append = money_pattern starts with '{{' %}
-        {% if not append %}
-            <span class="input-group-addon">{{ money_pattern|replace({ '{{ widget }}':''}) }}</span>
-        {% endif %}
+    {% set prepend = not (money_pattern starts with '{{') %}
+    {% set append = not (money_pattern ends with '}}') %}
+    {% if prepend or append %}
+        <div class="input-group">
+            {% if prepend %}
+                <span class="input-group-addon">{{ money_pattern|replace({ '{{ widget }}':''}) }}</span>
+            {% endif %}
+            {{- block('form_widget_simple') -}}
+            {% if append %}
+                <span class="input-group-addon">{{ money_pattern|replace({ '{{ widget }}':''}) }}</span>
+            {% endif %}
+        </div>
+    {% else %}
         {{- block('form_widget_simple') -}}
-        {% if append %}
-            <span class="input-group-addon">{{ money_pattern|replace({ '{{ widget }}':''}) }}</span>
-        {% endif %}
-    </div>
+    {% endif %}
 {%- endblock money_widget %}
 
 {% block percent_widget -%}