With this commit, we can now say "on preview/selection of a widget, also preview/selection these other widgets". For this, add a `data-trigger` with comma-separated widget names. A `data-trigger-value` can also be used to indicate the values these other widgets should have during preview/selection... but this currently only works for colorpicker widgets thanks to a big big hack that should be improved later. Part of https://github.com/odoo/odoo/pull/42986 closes odoo/odoo#42986 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>