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These can be used by Model subclasses to signal the exact operations
that happened to a model, so that persistent model indices in that
area are not invalidated.
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This patch adds persistent indices to models. A PersistentModelIndex is
a ModelIndex that will survive most model updates (provided that the
data the PersistentModelIndex points to has not been removed by the
model's data store). PersistentModelIndex objects can be safely held
by objects outside the model they originated from.
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The previous name did not describe what the function checked, and was
easy to confuse with ModelIndex::is_valid.
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Most of the models were just calling did_update anyway, which is
pointless since it can be unified to the base Model class. Instead, code
calling update() will now call invalidate(), which functions identically
and is more obvious in what it does.
Additionally, a default implementation is provided, which removes the
need to add empty implementations of update() for each model subclass.
Co-Authored-By: Ali Mohammad Pur <ali.mpfard@gmail.com>
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I've wasted a silly amount of time in the past fretting over which
of these words to use. Let's just choose one and use it everywhere. :^)
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SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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