pidgin/pidgin

Port list request fields from GtkTreeView to GtkListView

15 months ago, Elliott Sales de Andrade
470d4d3c6faf
Port list request fields from GtkTreeView to GtkListView

This uses the same "trick" used elsewhere of a plain `GObject` to store the
data we need in the list model.

Note this does not change datasheets.

Testing Done:
Opened a request with a list field and confirmed that the selected options were correct upon accepting the dialog.

Bugs closed: PIDGIN-17750

Reviewed at https://reviews.imfreedom.org/r/2294/
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