Hex8

The ColorPicker parses 8-digits hex correclty, but `onChange` is always received the hex value in 6-digit format. How can I use the value in hex with opactiy?

Start by tracing the ColorPicker's onChange path and how it normalizes 8-digit hex input. Check the existing color value handling and determine how opacity should be preserved in the callback. Done means onChange returns the selected color in an 8-digit hex format when opacity is present, with existing 6-digit behavior unaffected.

Written by the indexing model from the issue text.