[geary] Fix conversation viewer's spinners being huge with some themes.

[Michael Gratton <mjog src gnome org>]

commit 797bb44b7c7e978517828a4fe883d951eb24389d
Author: Michael James Gratton <mike vee net>
Date:   Sat Oct 22 09:20:08 2016 +1100

    Fix conversation viewer's spinners being huge with some themes.
    
    Bug 773054
    
    * src/client/conversation-viewer/conversation-list-box.vala
      (ConversationListBox::show_loading), ui/conversation-viewer.ui: Specify
      a width and height request for the spinners, ensure they are centered.

 .../conversation-viewer/conversation-list-box.vala |    2 ++
 ui/conversation-viewer.ui                          |    6 +++++-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/client/conversation-viewer/conversation-list-box.vala 
b/src/client/conversation-viewer/conversation-list-box.vala
index ac15caf..dc90c68 100644
--- a/src/client/conversation-viewer/conversation-list-box.vala
+++ b/src/client/conversation-viewer/conversation-list-box.vala
@@ -761,6 +761,8 @@ public class ConversationListBox : Gtk.ListBox {
 
     private void show_loading() {
         Gtk.Spinner spinner = new Gtk.Spinner();
+        spinner.set_size_request(32, 32);
+        spinner.halign = spinner.valign = Gtk.Align.CENTER;
         spinner.start();
         spinner.show();
         set_placeholder(spinner);
diff --git a/ui/conversation-viewer.ui b/ui/conversation-viewer.ui
index 1c0ac63..2e87072 100644
--- a/ui/conversation-viewer.ui
+++ b/ui/conversation-viewer.ui
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Generated with glade 3.20.0 -->
 <interface>
-  <requires lib="gtk+" version="3.10"/>
+  <requires lib="gtk+" version="3.14"/>
   <template class="ConversationViewer" parent="GtkStack">
     <property name="name">conversation_viewer</property>
     <property name="visible">True</property>
@@ -9,8 +9,12 @@
     <property name="transition_type">crossfade</property>
     <child>
       <object class="GtkSpinner" id="loading_page">
+        <property name="width_request">32</property>
+        <property name="height_request">32</property>
         <property name="visible">True</property>
         <property name="can_focus">False</property>
+        <property name="halign">center</property>
+        <property name="valign">center</property>
         <property name="active">True</property>
       </object>
       <packing>