Unwanted `onChangeComplete` triggered

When I press down the mouse button on the color palette, the `onChangeComplete` gets triggered,
then I drag to another color, after some milliseconds (~30-100?), it gets triggered again,
finally, I release the mouse button, nothing get triggered.

Expected :
Mouse down -> nothing
Drag -> `onChange`
Mouse up -> `onChangeComplete`

Start by reproducing the mouse interaction on the color palette and trace how its mouse-down, drag, and mouse-up events invoke onChange and onChangeComplete. Done means mouse-down invokes neither callback, dragging invokes onChange, and mouse-up invokes onChangeComplete.

Written by the indexing model from the issue text.