[FW][IMP] mail: add postOnActivityUpdate to activity button
For a document fix, we add a method to the activity button that implements custom behavior when an activity changes.
see odoo/enterprise#84128 task-4690165
Forward-Port-Of: odoo/odoo#213791 Forward-Port-Of: odoo/odoo#210988
@lm4649 @tde-banana-odoo this PR targets master and is the last of the forward-port chain.
To merge the full chain, use
@robodoo r+
More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port
@lm4649 @tde-banana-odoo this forward port of odoo/odoo#210988 is awaiting action (not merged or closed).
@robodoo r+
@lm4649 @tde-banana-odoo linked pull request(s) odoo/enterprise#87601 not ready. Linked PRs are not staged until all of them are ready.
@lm4649 @tde-banana-odoo this PR was modified / updated and has become a normal PR. It must be merged directly.
@robodoo r+
