popup: 'show tall drop down button', popup too tall on subsequent opening of the popup

[lbod]

1. load delite/tests/functional/popup.html in your browser
2. resize the browser to the point where the show tall drop down button button shows the popup above the button.
3. once you're at that point, reload the page and launch the show tall drop down button popup
4. close the popup (focussing elsewhere on the page)
5. launch the show tall drop down button popup again you should see the popup obscures the button.

This is related to #347

The first launch shows:

The next launch shows:

A simple change again is needed to https://github.com/ibm-js/delite/blob/master/popup.js#L422 e.g.

from:

wrapper.style.height = args._naturalHeight > maxHeight ? maxHeight + "px" : "auto";

to:

wrapper.style.height = args._naturalHeight >= maxHeight ? maxHeight + "px" : "auto";

[wkeese]

Again, your change doesn't look right. The naturalHeight should be something like 2000, and the maxHeight should be something like 400, so > and >= should return the same result.

[wkeese]

This works correctly now; it actually started working correctly in ee21727.