[gnome-games/wip/exalm/unified-window: 39/60] collection-header-bar: Add .titlebar style class to headerbars

[Alexander Mikhaylenko <alexm src gnome org>]

commit 07a4d7ae4357618a151bed912ce4d089560adae8
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Apr 10 02:48:36 2020 +0500

    collection-header-bar: Add .titlebar style class to headerbars
    
    This will be needed when they are moved inside the window.

 data/ui/collection-header-bar.ui | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/data/ui/collection-header-bar.ui b/data/ui/collection-header-bar.ui
index 73faac3a..9893b159 100644
--- a/data/ui/collection-header-bar.ui
+++ b/data/ui/collection-header-bar.ui
@@ -13,6 +13,9 @@
             <property name="visible">True</property>
             <property name="show-close-button">True</property>
             <property name="centering-policy">strict</property>
+            <style>
+              <class name="titlebar"/>
+            </style>
             <child>
               <object class="GtkButton" id="add_game">
                 <property name="visible">True</property>
@@ -101,6 +104,9 @@
             <property name="visible">True</property>
             <property name="show_close_button">True</property>
             <property name="title" bind-source="GamesCollectionHeaderBar" bind-property="subview-title" 
bind-flags="bidirectional"/>
+            <style>
+              <class name="titlebar"/>
+            </style>
             <child>
               <object class="GtkButton">
                 <property name="visible">True</property>