Log a message when navigation is throttled

[dfabulich]

This bit me hard when I was trying to write automated tests against the Showcase… took me a loooong time to track down. A little bit of logging would have gone a long way to help me figure it out!

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[marcprux]

Seems useful.

Even more useful would be to get rid of the need to perform the throttling (which was added in a11d2f5), if we can find some alternative solution. Perhaps Navigation 3 (#292) would obviate the hack?

[dfabulich]

I filed #376 to get rid of navigation throttling.