Tooltip Memory Leak

[matthias-ccri]

I think I've identified the cause of a memory leak in my company's app. The tooltip directive registers a keypress listener on an event, and does not remove it.

bootstrap/src/tooltip/tooltip.js

Lines 547 to 551 in 7855976

	element.on('keypress', function(e) {
	if (e.which === 27) {
	hideTooltipBind();
	}
	});

This creates a jquery cache entry, which retains the scope through the context.
For all the other listeners registered in prepTriggers(), they are deregistered in unregisterListeners(). Seems to me that the keypress listener should get deregistered too.

Before I go through the trouble of creating a plunkr, would you agree that the leak is obvious enough? The fix would be to make the keypress listener function into a named function, and deregister it at the end of the unregisterListeners function.

Thanks

[wesleycho]

This looks correct - feel free to open a PR.

[matthias-ccri]

Alright, here's a PR: #6423

Thanks!