[gnome-builder] prefs: fix linked header bar styling on Adwaita

[Christian Hergert <chergert src gnome org>]

commit 58eb7474e278e3f75e38a55da236d43aae62d90a
Author: Christian Hergert <christian hergert me>
Date:   Mon Aug 31 04:43:22 2015 -0700

    prefs: fix linked header bar styling on Adwaita

 data/theme/Adwaita-shared.css    |    8 ++++++++
 data/ui/gb-preferences-window.ui |    2 ++
 2 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/data/theme/Adwaita-shared.css b/data/theme/Adwaita-shared.css
index 7256208..6af6067 100644
--- a/data/theme/Adwaita-shared.css
+++ b/data/theme/Adwaita-shared.css
@@ -1,6 +1,14 @@
 @import url("resource:///org/gnome/builder/theme/shared.css");
 
 
+#left_header_bar {
+  border-top-right-radius: 0px;
+}
+#right_header_bar {
+  border-top-left-radius: 0px;
+}
+
+
 /*
  * Preferences styling.
  */
diff --git a/data/ui/gb-preferences-window.ui b/data/ui/gb-preferences-window.ui
index fe3cf18..ae59c35 100644
--- a/data/ui/gb-preferences-window.ui
+++ b/data/ui/gb-preferences-window.ui
@@ -14,6 +14,7 @@
         <property name="orientation">horizontal</property>
         <child>
           <object class="GtkHeaderBar" id="left_header_bar">
+            <property name="name">left_header_bar</property>
             <property name="visible">True</property>
             <property name="title" translatable="yes">Preferences</property>
             <property name="show-close-button">True</property>
@@ -47,6 +48,7 @@
         </child>
         <child>
           <object class="GtkHeaderBar" id="right_header_bar">
+            <property name="name">right_header_bar</property>
             <property name="visible">True</property>
             <property name="expand">True</property>
             <property name="title" translatable="yes"></property>