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Paolo Borelli authored
Instead of reimplementing our singleton for the style scheme manager, leverage the gtksourceview one, so that plugins can simply obtain it with get_default(). We just need to make sure the search path is set at startup before any document is opened. The utility functions to install/uninstall a style scheme are now in the pref dialog file since in five years we never needed to export them or use them in another context.
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