Textinput: height correctly calculated (without extra padding) for box-sizing

[jhogervorst]

Fixes #5690. As I explained there, scrollHeight contains the padding of the element as well, while the height passed to .height() should only be of the content. Because of that we subtract the padding height.

[jaspermdegroot]

hi @jhogervorst

Thanks for the new PR!
.css() returns 0 if no padding has been set so it seems safe to remove the || 0. Or did you find cases where it results in an empty string or NaN?

[jhogervorst]

@uGoMobi You're right, the || 0 is not necessary. I searched through the source code to see how this was done in other places. It turned out that I looked at the jQuery source instead of the jQuery Mobile source. I will change this – you should see the changes in this pull request later today. Thanks for your feedback!

[jaspermdegroot]

@jhogervorst - Ok, great! I will merge after your commit.