🚀 go-pugleaf

I tried posting this earlier, but suspect it never got out.  Sorry if
you've seen it before.

We are having a problem with InterViews 3.0 beta getting a
StringEditor and a Button to interact correctly.  The StringEditor is
supposed to give up control (return from its Handle function) whenever
it Reads an event targetted for someone else.  Our intent is to be
able to type a string into the StringEditor, and then hit the Button
to accept the input.

In practice, the Interactor::Read function called in
StringEditor::Handle never returns, beacuse the event it gets back
from Event::read does not have a target or handler().  This appears to
be caused by the fact that Interactor::target has not been called to
fix up the 'backward compatibility' portions of the event structure.
Of course, that's hardly surprising, because the Button isn't an
interactor; it's a 3.0 Button, not a 2.6 Button.  This theory is borne
out by the fact that two StringEditors can pass control back and forth
quite happily, but neither will yield control to the Button.

Is this behaviour a bug?  If not, to what extent should mixing 2.6
stuff with 3.0 stuff work?

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