Make xwidget-events special and document xwidget callbacks
Users have always been supposed to use callbacks for handling xwidget events, but for some reason this has not been documented until now. * doc/lispref/commands.texi (Xwidget Events): Document xwidget callbacks and the special status of `xwidget-event's. * doc/lispref/display.texi (Xwidgets): Add xwidget property list functions to the concept index. * lisp/xwidget.el: Make xwidget events special.
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