- Allow to continue to edit a form while saving is on going
- Reset fields on form view update (like by clicking on the active tab from the panel)
- Fix rendering an input like gadget with the same value as rendered before causes the
  gadget to be not updated even if the field has been manually edited.

/bug #20190204-39AF19
https://nexedijs.erp5.net/#/bug_module/20190204-39AF19

/reviewed-on nexedi/erp5!861