Keep Hue value when Saturation or Value is zero #46230
Merged
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In ColorPicker, when Saturation or Value slider is zero, The UV and W box is reset to red. And the hue slider won't work.
This happened when color was set from sliders. Then the UV and W boxes need to update after the color changes. The received new HSV values are converted from the new RGB color. If R == G == B (Gray), The original hue value is lost.
This PR updating HSV from slider values directly to avoid to lost the original hue value.
Should help solve some bug in #46110.