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Vala, GLib and GTK+ cheatsheet
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cheatsheet.md

Enable debug messages

Set the following environment variable G_MESSAGES_DEBUG=all. This will allow you to see messages you print with debug in Vala.

Markup escaping

If you try and set_text on a Gtk.Label a string which might contain markup characters (<>&), you need to escape them first, using GLib.Markup.escape_text.

Path constructing

Instead of using standard string constructing method path_string1 + path_string2 you can use GLib.Path.build_filename method in order to construct a valid path to a file, for example: GLib.Path.build_filename (GLib.Environment.get_home_dir (), "folder1", "folder2").

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