Modal dialog wrongly closed by escape key

[tomhicks]

This might be a browser issue to do with how keyboard events are emitted, but anyway...

To reproduce (in Chrome, not tried other browsers):

1. Go to the Bootstrap JavaScript page (http://getbootstrap.com/javascript/#modals) and the modal Live Demo.
2. Click the button to open the modal, and wait until it is shown
3. Press Ctrl-S and wait for the browser's Save dialog to be shown
4. Press and hold the Escape key (the Save dialog will close)
5. Release the escape key

Expected behavior:
The dialog should not close

Actual behavior:
The dialog closes.

This is not just when you hold the escape key down for a long time - it'll happen with a normal press. I presume the escape key listener is on keyup, causing this behavior?

[hnrch02]

Somewhat related to #13816. Seems like a decent decision to move away from *up in general and move to *down.

[cvrebert]

Confirmed in v3.2.0 in Firefox & Chrome on OS X.

[dvdliao]

Same issue occurs if escape key is pressed when a select menu is open inside a modal
Expected behavior:
select menu closes and modal dialog stays open
Actual behavior:
modal dialog closes