zoomToShowLayer fails after initial spiderfy.

[sharkinsspatial]

As referenced in issue #203 and pull request #228, after a cluster is initially spiderfied zoomToShowLayer fails if the view extent has been changed by a method which does not collapse the cluster (such as panTo) as the layer._icon is still present due to zoomToShowLayer. You can reproduce this issue with this fiddle by clicking 'Zoom to marker', then 'Cause issue' and the 'Zoom to marker' again. There seems to be a pretty simple fix similar to that in #228 but you mentioned in #203 that we might want to look at it more deeply.

[Grsmto]

Hi,

I'm commenting here cause I fell into a deep bug about the zoomToShowLayer function.

This is happening when all markers inside a cluster have the same position AND your initial map position is the same (centered on this cluster). The callback of zoomToShowLayer() is simply not called.
You can see an example of the bug here: http://jsfiddle.net/Grsmto/77DBE/5/

I'm looking for a fix and I'll try to do a PR if I find something, bug maybe you have an idea of how to fix this issue easily?

[danzel]

@Grsmto Thanks, have added a fix for this, it should be a bit more reliable than just checking the center.

[Grsmto]

@danzel Awesome, thank you! :)