Apex theme: Ensure vertical centering of ButtonElement's icon
Apex theme: Ensure vertical centering of ButtonElement's icon

Bug: T166212
Change-Id: I056f11b3aa9268b63029ba71ecf61fe2ea44451c

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