cambalache crashes when using
I have this XML schema and it causes cambalache to crash. I don't understand why.
<?xml version='1.0' encoding='UTF-8'?>
<!-- Created with Cambalache 0.16.0 -->
<interface>
<!-- interface-name main.ui -->
<requires lib="gtk" version="4.6"/>
<requires lib="libadwaita" version="1.0"/>
<object class="AdwApplicationWindow" id="main_window">
<property name="content">
<object class="AdwViewStack" id="stack">
<child>
<object class="AdwViewStackPage" id="backups_page">
<property name="child">
<object class="GtkBox">
<property name="height-request">300</property>
<child>
<object class="GtkLabel">
<property name="height-request">350</property>
<property name="label">Hello There</property>
</object>
</child>
</object>
</property>
<property name="icon-name">drive-harddisk</property>
<property name="name">backups</property>
<property name="title">Backups</property>
</object>
</child>
</object>
</property>
<property name="titlebar">
<object class="AdwHeaderBar" id="header">
<child>
<object class="AdwViewSwitcher" id="switcher">
<property name="policy">wide</property>
<property name="stack">stack</property>
</object>
</child>
</object>
</property>
</object>
</interface>
It only happens when I set the titlebar property on the AdwApplicationWindow.