There is one active input handler per text area (), plus a number of active stacked input handlers.
The text area also stores a reference to a default input handler, but that is not necessarily active.
Stacked input handlers work in addition to the set of currently active handlers (without detaching them). They are detached in the reverse order of being attached.
Assembly: ICSharpCode.AvalonEdit (Module: ICSharpCode.AvalonEdit.dll) Version: 188.8.131.5238