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Strangeness in HSL Shift panel

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I have an image that was imported from a PDF where I've been doing some color changes. When I first added an HSL Adjustment layer, all was cool. Left the tab open, went off, did other things... eventually back to the work at hand, double-clicked to modify, get the screenshot for the panel. Closing and reopening the editor panel does not change the behavior.

macOS 11.0.1 (intel MBP2018 15" 32G, 2.9 GHz 6-Core Intel Core i9, Radeon Pro Vega 20 4 GB, Metal enabled), Affinity Photo 1.8.6

A bug? Seems to be environmental in some fashion since closing the file and reloading from disk makes the issue go away.

ETA: This happened on a non-retina external display. I did not test whether it happened on the built-in display before reloading the file and the problem disappearing.

ETA 2: It has something to do with non-retina displays and/or moving the panel to the retina display causes a "corrective" redraw. Obviously, the condition re-occurred -- I moved the HSL edit panel to the internal display, the layout corrected itself, even after returning the panel to the non-retina external.

Screen Shot 2020-12-03 at 3.07.48 PM.png

Edited by Brad Brighton
Added info about displays behaviors.

https://bmb.photos | Focus: The unexpected, the abstract, the extreme on screen, paper, & other physical outputTools: macOS (Primary: Ventura, MBP2018), Canon (Primary: 5D3), iPhone (Primary: 14PM), Nikon Film Scanners, Epson Printers

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