We don't want to grow the titlebar by showing an empty label.
gtk_widget_show (box);
gtk_widget_set_size_request (box, -1, 16);
label = gtk_label_new ("");
+ gtk_widget_set_no_show_all (label, TRUE);
gtk_widget_set_margin_top (label, 6);
gtk_widget_set_margin_bottom (label, 6);
gtk_style_context_add_class (gtk_widget_get_style_context (label), "title");
<interface domain="gtk30">
<!-- interface-requires gtk+ 3.10 -->
<template class="GtkMessageDialog" parent="GtkDialog">
- <property name="title"> </property>
+ <property name="title"></property>
<property name="resizable">0</property>
<property name="type_hint">dialog</property>
<property name="skip_taskbar_hint">1</property>