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Class
AlphanumericFilter
sealed
Inherits:InputFilterBase
Filters alphanumeric input: Unicode letters and ASCII digits [0-9].
public override bool Allows(in EditProposal proposal)Whether the proposed edit may be applied, judged on the post-state it produces. Return false to drop it; the editor then discards it without firing TextChanged. Pure deletions never reach this — character filters do not block deleting.