I just upgraded from kendo 2015.3.930 to 2017.2.504 and I've found a bug regarding the Window.
You can reproduce this bug in the kendo's window demo. All you have to do is to to resize the window height using the top or the bottom resize handle. You'll notice that the bottom section of the window will disappear, hidden by the k-window-content div.
This seems to be related to the box-sizing attribute of the k-window-content element that was changed from border-box to content-box.
See attached picture. Left window was made with box-sizing = border-box and right is the same window with box-sizing = content-box.
Can you confirm if I'm right about this?
Regards,
Simon