change algorithm for activation/propagation of key events to allow multiple bindings

We now check from the focus widget (if any) for any widget heirarchy bindings, and try to use them.
Next use the "top level" bindings passed in (top level is quoted because they may be owned by a tab,
rather than a window).
Finally, if the event is still not handled, try the global bindings

This model more closely matches what I think a reasonable programmer with experience of other
GUI toolkits would expect, and allows us to have multiple bindings present (though not
simultaneously used) in a given window

0 files changed, 0 insertions, 0 deletions