Sound cue editor node connections only animate when the mouse is moving

Also occurs in 4.15.2 so not a regression

1. Open QAGame
2. Right click in the Content Browser and create a Sound Cue
3. Open the created sound cue in the editor
4. Add a Wave Player node and connect it to the output
5. Select the Wave Player node
6. Select FemaleVoice as the Sound Wave and enable looping
7. Click on the Play Cue button

Result: node connector only animates when the mouse is moving