Gio.ListStore overrides: use splice() when adding/removing many items with newer GLib. See #115

Merged Christoph Reiter requested to merge gio-lists-tore-splice-fallback into master

g_list_store_splice() was broken when adding items and fixed with glib 2.57.1. See

This makes the override code use the fast splice method with newer glib and uses a slower fallback version with broken glib versions.

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