Niels De Graef 14ba521b6d gliststore: Add item lookup functions
Currently, there is no quick way to find whether and element is already
part of a list store, except for manually writing a for-loop and calling
`g_list_model_get_item()` and breaking when you find the item.

This is mostly just a small API addition to support this use case.

Fixes https://gitlab.gnome.org/GNOME/glib/issues/1011
2019-09-25 08:37:22 +02:00
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