Affinity Photo 2.x soft proof: inconsistent highlighting of out-of-gamut check in 32bit

[barnold84]

Hello,

When doing soft proof in Affinity photo, the out-of-gamut check should highlight the out-of-gamut pixels in gray (as per documentation and as one finds it for 8 and 16-bit editing). If the image is edited in 32-bits, the "highlighting" isn't gray but black, i.e. out-of-gamut pixels are displayed as black.

I recommend fixing this.

Björn