redraw continuously long enough for dash transitions to finish

[ansis]

Dashed lines sometimes get stuck in the middle of a transition. It should repaint long enough for the transition to finish. I think this might also be a problem with labels fading in.

from @ljbade:

[ljbade]

Adding to the list that faded labels also need to redraw long enough.

[brunoabinader]

#1548 should fix this.