Thanks for the merge. 

I pulled the change and checked the result, but I found the patch missing a line to initiate the correct display state when the button was created. That is, it forgot to set `button.data('hidden', 'false');` when adding the button. 

This causes the first click on the button to have no effect. But the following clicks will work.

I filed the new patch to add this line back. I'm so sorry I missed this line :(