[gnome-contacts] Window: Put right pane elements into a size group

[Niels De Graef <nielsdg src gnome org>]

commit 2ab00b516be467851385e432baecd3894ab2a792
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Oct 18 14:06:20 2018 +0200

    Window: Put right pane elements into a size group
    
    This ensures the right pane elements request the same minimum width,
    which is going to be needed when we will use leaflets.

 data/ui/contacts-window.ui | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/data/ui/contacts-window.ui b/data/ui/contacts-window.ui
index 87476c3..f7ea3ae 100644
--- a/data/ui/contacts-window.ui
+++ b/data/ui/contacts-window.ui
@@ -366,6 +366,13 @@
       <widget name="loading_box"/>
     </widgets>
   </object>
+  <object class="GtkSizeGroup" id="right_pane_size_group">
+    <property name="mode">horizontal</property>
+    <widgets>
+      <widget name="right_header"/>
+      <widget name="contact_pane_container"/>
+    </widgets>
+  </object>
   <object class="HdyHeaderGroup" id="header_group">
     <headerbars>
       <headerbar name="left_header"/>