$watch on form.$invalid not triggered when control removed

[coli]

Example at http://jsfiddle.net/ADukg/781/

If you remove all the textboxes, the formController.$invalid is set to false, however, the watcher on $invalid is not triggered so the binding of {{testForm.$invalid}} says true, instead of the real value of false.

[coli]

Interestingly, this works http://jsfiddle.net/ADukg/782/

[coli]

BTW, my workaround right now is to manually fire a digest cycle (via timer) when you remove a row...

[pkozlowski-opensource]

Duplicate of #1572

[pkozlowski-opensource]

Closing as a duplicate.