Testing update for color_picker

#380 in iced-rs/iced_aw — merged 2025-12-28

The ColorPicker widget lacked operate() implementations, preventing iced_test from discovering and interacting with its buttons.

Remediation

1. Added operate() method to ColorPicker widget
2. Added operate() method to ColorPickerOverlay
3. Rewrote integration tests** (tests/color_picker_integration_tests.rs)

What I Didn't Do

I didn't make the 6 color manipulation areas testable (HSV canvas, RGBA sliders). These are custom-drawn canvas elements, not widget components. The color sliders use custom canvas drawing and direct event handling, not the widget tree. Making them testable would require either:

• Refactoring to use Slider widgets (breaking change)
• Creating custom operation types for canvas interactions (complex)

It seems to me that the cost/benefit doesn't justify it - the critical user actions (opening picker, accepting/canceling) are now testable.

Impact

• No breaking changes - purely additive internal implementations