since...

commit db42098d
Date:   Fri Feb 9 10:47:48 2018 +0200

    use VirtualDevice in ColorFieldControl

    as part of moving use of BitmapWriteAccess inside of vcl/

changing the radiobutton selected used to change the
contents of the color picker widget, after that point it
got locked to the original contents.

Change-Id: I94c730f1868efc388cba7720364bc04a666d4fbd
Reviewed-on: https://gerrit.libreoffice.org/50969Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>