Bug#41431: [patch] Text cursor is not visible while moving around with arrow keys

The attached patch restarts the blink timer whenever the cursor is moved, 
which makes for much more pleasant scrolling.

Setting cursorOn = true; is already better than the current state. 
Resetting the timer is more pleasant because it makes sure that the cursor 
will remain visible for a short time after the user stopped scrolling. It 
also prevents the situation where the cursor disappears for a short time 
when an arrow key is pressed before the key repeat kicks in.

hth,
Nicolai

(Complete bug history is available at http://bugs.kde.org/db/41/41431.html)