Following some discussion on this list of a proposed patch, I've changed
the interpretation of client-side GUI event handlers. They no longer by
default block propagation of handled events to parent GUI elements.
Instead, code should call [stopPropagation] explicitly to get that behavior.
I've pushed this change to the public Ur/Web Mercurial repo. I'll hold
off on making a new release with the change for at least a week, because
*the change breaks backward compatibility for Ur/Web apps using
client-side GUIs*. If you have such an app, please check that it still
functions as expected. Some source-code changes may be required to work
with the new Ur/Web, which should go out as a formal release (possibly
with other changes in the mean time) in the next few weeks.
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