[libdazzle] prefs: tweak layout for preferences using stackswitcher

[Christian Hergert <chergert src gnome org>]

commit 05a78f2cf3e6841bcee125e9e3788a573e4c53aa
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jun 21 14:54:39 2018 -0700

    prefs: tweak layout for preferences using stackswitcher

 data/themes/shared/shared-preferences.css | 2 +-
 src/prefs/dzl-preferences-view.ui         | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/data/themes/shared/shared-preferences.css b/data/themes/shared/shared-preferences.css
index 12ecd08..85dff67 100644
--- a/data/themes/shared/shared-preferences.css
+++ b/data/themes/shared/shared-preferences.css
@@ -42,5 +42,5 @@ dzlpreferencesview dzlpreferencesgroup list entry {
 }
 
 dzlpreferencesview stackswitcher {
-  margin: 12px;
+  margin: 12px 12px 0px 12px;
 }
diff --git a/src/prefs/dzl-preferences-view.ui b/src/prefs/dzl-preferences-view.ui
index c7aac68..6036bec 100644
--- a/src/prefs/dzl-preferences-view.ui
+++ b/src/prefs/dzl-preferences-view.ui
@@ -31,15 +31,19 @@
         </child>
         <child>
           <object class="GtkScrolledWindow" id="scroller">
+            <property name="expand">true</property>
             <property name="hscrollbar-policy">never</property>
+            <property name="propagate-natural-width">true</property>
             <property name="visible">true</property>
             <child>
               <object class="GtkBox">
                 <property name="orientation">vertical</property>
+                <property name="expand">true</property>
                 <property name="visible">true</property>
                 <child>
                   <object class="GtkStackSwitcher" id="top_stack_switcher">
                     <property name="stack">page_stack</property>
+                    <property name="halign">center</property>
                     <property name="visible">false</property>
                   </object>
                 </child>