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Jeb Brooks ea06f80230 Optionally allow FeathersColorSwatch to partially display opaque value (#24639)
This adds properties to the `FeathersColorSwatch` SceneComponent to
allow specifying a percentage of the swatch to remain opaque. This is
useful for color-pickers and generally handling colors with alpha
channels.

The property value will default to 0% so no migration guide is needed.

# Objective

- Allow a single `FeathersColorSwatch` to display the selected color
with and without its alpha channel.

## Solution

- Adds `FeathersColorSwatchProps` to allow dedicating a percentage of
the swatch area to the opaque color value

## Testing

Updated the `feathers_gallery` example to display the `rgba` color
swatch with 30% dedicated to the opaque color.

---

## Showcase

<img width="1280" height="720" alt="Screenshot_2026-06-15_21-09-53"
src="https://github.com/user-attachments/assets/1b3405f5-973b-42fb-abd5-b08c39c59cb6"
/>
2026-06-17 05:18:25 +00:00
..
2026-05-21 11:08:44 +00:00
2026-04-29 15:59:37 +00:00
2026-06-02 00:52:42 +00:00