ID 420684 - Backdrop label color doesn't behave as expected

Problem summary
Backdrop label color doesn't behave as expected

When changing the backdrop's tile color, it should change the color of the font in the UI, to make it contrast the backdrop tile_color

Steps to reproduce

1) Open Nuke

2) Make a Backdrop Node

3) Type something into the label

4) Change the tile_color to white, the label text should turn black

Expected behaviour
The text to be black on light coloured backdrops, and white on light colour backdrops

Actual behaviour

The text in the backdrop node is nearly always white, and you can't change it due to TP 369441

Reproduced

Windows 10 - Nuke 12.1v1

Not Reproduced

Windows 10 - Nuke 12.0v3