Bug 452422

Created attachment 148062 [details]
Screenshot of Krita with the Advanced Color Selector + "Show color selector" popup out of sync

SUMMARY
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STEPS TO REPRODUCE
1. Open Advanced Color Selector docker
2. Click the icon to configure it
3. Select HSY' as the Color Model Type
4. Select the last color selector shape (rectangle with hue / saturation across all colors with a value strip at the top)
5. Click OK
6. Select some color in the Advanced Color Selector
7. Notice value strip at the top is updated to reflect the currently selected color across different values
8. Press hotkey for "Show color selector"
9. Notice value strip at the top of the popup is grayscale instead of based on the current color, while the one on the Advanced Color Selector is still as it was
10. Select a color in the popup
11. Notice value strip at the top of the popup now reflects the currently selected color but the Advanced Color Selector's value strip is now grayscale
12. Select a color on the Advanced Color Selector
13. Notice the value strip is updated as expected
14. Try the "Show color selector" hotkey and notice the value strip grayscale in the popup again

OBSERVED RESULT
The Advanced Color Selector and the "Show color selector" popup when used together alternate between which one has a value strip reflecting the current color and which one has a value strip in grayscale depending on which was last used to select the color.

EXPECTED RESULT
I would expect both to stay in sync with the value strip always reflecting the current color rather than being grayscale.

SOFTWARE/OS VERSIONS
Windows: Windows 10 Pro, Version 21H1, OS build 19043.1586
macOS: N/A
Linux/KDE Plasma: N/A
(available in About System)
KDE Plasma Version: N/A
KDE Frameworks Version: N/A 
Qt Version: 5.12.12

ADDITIONAL INFORMATION
This is using 5.0.2-alpha (git 6edabfa) that I downloaded / installed from the latest nightly builds.

I very briefly tried selecting a color in the Popup Palette as well (right click menu) and it causes the same behavior of forcing the Advanced Color Selector into grayscale for the value strip when selecting a color inside of it but the inverse doesn't happen (selecting a color with the Advanced Color Selector doesn't cause the Popup Palette's color selector to go grayscale for the value ring and instead it stays in sync).