Matthias Clasen d8a0dcb11e list store: Fix overflow issues
Check for over- and underflow when manipulating positions.

This makes the sequence
  g_list_model_get_item (store, 0);
  g_list_model_get_item (store, -1u);
return NULL for the second call, as it should.

Closes: #1639
2019-01-07 08:53:16 -05:00
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