The slider was repeatedly sending arrow keys, which change the focused
input when the end of a text box is hit.
A new key is added that implements cursor movements using the
`InputConnection` API.
The new keys are defined as `KeyValue.Editing`, which are no longer only
context menu actions.
The behavior when a selection has started is changed. The selection is
modified instead of cleared even when shift isn't pressed or the
selection would become empty.
Fallbacks to sending arrow keys for editors that do not support the API,
like Termux.
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