'Help' button hover state

The ‘Help’ button, on hover, could have a dotted line border during the onHover and onClick states, much like the ‘x’ button when closing a GNOME dialog.

Parent Task: #11643 (closed)

Related issues

Related to #10990 (closed)

Original created by @SpencerOne on 11471 (Redmine)

Edited Nov 22, 2019 by intrigeri

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