Adding markers between calls to setView breaks when animation enabled.

[emartinez-usgs]

The map locks up and becomes unusable if you set an initial center and zoom (via constructor), or later set the view (via setView), then add a marker to the map, then set the view again (another call to setView). Additionally, the final call to setView does not take effect.

Tested against v0.7 and current master (daf7345).
Example: http://jsfiddle.net/e5YZ7/

Some Notes:

• I couldn't write a unit test to reproduce this because it seems if you document.createElement('div') the map container, then this works as expected, but if you pull a container out of an existing DOM then the bug reproduces.
• This is not an issue if map.options.markerZoomAnimation === false
• This is not an issue if {reset: true} is passed to setView calls.

[danzel]

I'm sure we had an existing bug for this, but I'm having trouble finding it.
Previously calling setView twice in a row after just adding the map would make the map lock up. Can't find the bug though...
IIRC we are waiting for a transitionEnd event that will never happen.