Select Widget in TitlePane is not properly shown

[evra]

Bug

An expended select widget inside a title-pane is shown incorrectly, parts of the select box are not shown.

Browser
Chrome 68, Windows 10.

Code

w(TitlePane, {
	title: 'Dojo Select in Title-pane',
	key: 'select-title-pane'
}, [ w(Select, {options: [ 'foo', 'bar', 'baz', 'qux' ]}) ]),

Expected behavior:
Select box overlays title pane.

Actual behavior:

Select box is partually hidden.
It looks like the problem is in the
overflow: hidden defined in the titlepane.

Closed:

Open: