run onBeforeTextEvent also for undo and redo events
#3589
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The
onBeforeTextEventis not documented, but it has been discussed here, for example. Currently this callback is only called for "new" events, but not for those coming from undo or redo events. This means that these latter events are missed if one usesonBeforeTextEventto monitor how a buffer changes. This PR fixes this by moving the invocation of the callback to a function that is also called for undo and redo events.