Can't add GtkHeaderBar to window with existing widgets / containers
Trying to add GtkHeaderBar
to this simple window:
<?xml version="1.0" encoding="UTF-8"?>
<interface>
<requires lib="gtk+" version="3.24"/>
<object class="GtkApplicationWindow" id="window_main">
<property name="width-request">600</property>
<property name="visible">True</property>
<property name="can-focus">False</property>
<property name="gravity">north</property>
<property name="show-menubar">False</property>
<child>
<object class="GtkBox">
<property name="visible">True</property>
<property name="can-focus">False</property>
<property name="hexpand">True</property>
<property name="vexpand">True</property>
<property name="orientation">vertical</property>
<child>
<placeholder/>
</child>
</object>
</child>
<child type="titlebar">
<placeholder/>
</child>
</object>
</interface>
appears to not be possible:
Glade 3.38.2
Gtk3 3.24.24-1
Debian Linux testing
Edited by Witold Baryluk