Sets the list of directories where the @lm looks for
language files.
If @dirs is %NULL, the search path is reset to default.
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.
Since GtkSourceView 5.4 this function will allow you to provide
paths in the form of "resource:///" URIs to embedded GResources.
They must contain the path of a directory within the GResource.
Sets the list of directories where the @lm looks for language files.
If @dirs is %NULL, the search path is reset to default.
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.
Since GtkSourceView 5.4 this function will allow you to provide paths in the form of "resource:///" URIs to embedded GResources. They must contain the path of a directory within the GResource.