Clicking on a button in an unselected form of a list-form triggers the call on the selected one

The title is quite self explanatory, in the GTK client clicking on a button in an unselected lines while on list-form mode triggers the expected call to the server but on the currently selected line.

In sao, the call is triggered on the clicked line.

The proposed patch will align the behaviour between the clients so that they work like the list mode. That is the click on the button selects the line and a click on the button of a selected line triggers the call for all selected lines.