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Don't pass NULL to gdk_window_set_title
That is not allowed. This is fallout from a recent change that makes GtkWindow listen for title changes in its headerbar.
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@ -1792,11 +1792,14 @@ gtk_window_set_title_internal (GtkWindow *window,
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g_free (priv->title);
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priv->title = new_title;
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if (new_title == NULL)
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new_title = "";
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if (gtk_widget_get_realized (widget))
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gdk_window_set_title (gtk_widget_get_window (widget), priv->title);
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gdk_window_set_title (gtk_widget_get_window (widget), new_title);
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if (priv->titlebar != NULL && update_titlebar)
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gtk_header_bar_set_title (GTK_HEADER_BAR (priv->titlebar), priv->title);
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gtk_header_bar_set_title (GTK_HEADER_BAR (priv->titlebar), new_title);
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g_object_notify (G_OBJECT (window), "title");
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}
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