gnome: show spinner when making a call

Show the spinner until the call starts.

Refs #75632

Change-Id: I7ae7be2114fafd94698fb4eabf64bbc8aea06b3e
diff --git a/ui/incomingcallview.ui b/ui/incomingcallview.ui
index 7b04ded..2fa3cc5 100644
--- a/ui/incomingcallview.ui
+++ b/ui/incomingcallview.ui
@@ -62,6 +62,23 @@
                   </packing>
                 </child>
                 <!-- end name or other identity of contact -->
+                <!-- call initialization progress -->
+                <child>
+                  <object class="GtkSpinner" id="spinner_status">
+                    <property name="visible">False</property>
+                    <property name="can_focus">False</property>
+                    <property name="active">True</property>
+                    <property name="height-request">25</property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkLabel" id="placeholder">
+                    <property name="visible">False</property>
+                    <property name="can_focus">False</property>
+                    <property name="height-request">25</property>
+                  </object>
+                </child>
+                <!-- end of call initialization progress -->
                 <!-- call state info -->
                 <child>
                   <object class="GtkLabel" id="label_status">