Sets the list of directories where the @lm looks for
language files.
If @dirs is %NULL, the search path is reset to default.
<note>
<para>
At the moment this function can be called only before the
language files are loaded for the first time. In practice
to set a custom search path for a #GtkSourceLanguageManager,
you have to call this function right after creating it.
</para>
</note>
Sets the list of directories where the @lm looks for language files. If @dirs is %NULL, the search path is reset to default.
<note> <para> At the moment this function can be called only before the language files are loaded for the first time. In practice to set a custom search path for a #GtkSourceLanguageManager, you have to call this function right after creating it. </para> </note>