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2e1e1392ea
on_down() iterates over _view_update_handlers_list, but it yields during iteration,
and while it yields, elements in that list can be removed, resulting in a
use-after-free.
Prevent this by registering iterators that can be potentially invalidated, and
any time we remove an element from the list, check whether we're removing an element
that is being pointed to by a live iterator. If that is the case, advance the iterator
so that it points at a valid element (or at the end of the list).
Fixes #4912.
Tests: unit (dev)
(cherry picked from commit 301246f6c0)