new-call-box: wrap dialer in scrolled window

It was possible to increase the window's size below the
minimum size of the dialer view. As such it is important
to wrap it in a scrolled window in order not to lose
access to otherwise hidden interface components.

This is, of course, not a replacement for a better
adapting dialer.

Signed-off-by: Markus Göllnitz <camelcasenick@bewares.it>
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/791>

src/ui/new-call-box.ui

@@ -2,6 +2,10 @@
 <interface>
   <template class="CallsNewCallBox" parent="AdwBin">
     <child>
+      <object class="GtkScrolledWindow">
+        <property name="hexpand">True</property>
+        <property name="vexpand">True</property>
+        <property name="child">
           <object class="GtkBox" id="child">
             <property name="hexpand">True</property>
             <property name="margin-start">24</property>
@@ -78,6 +82,8 @@
               </object>
             </child>
           </object>
+        </property>
+      </object>
     </child>
   </template>
 </interface>