Apex theme: Align functionality of ComboBoxInputWidget with WikimediaUI theme
Apex theme: Align functionality of ComboBoxInputWidget with WikimediaUI theme

Aligning functionality of ComboBoxInputWidget with WikimediaUI theme by
making button's interactive area bigger to increase its usability.

Bug: T150781
Change-Id: Idd8a8aac3bcf2bc4b0348569fc0e2bccf429f94c

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui