eager argument to watch

[ahuang11]

def callback(event):
    select.disabled = True
    button.disabled = True
    time.sleep(5)
    select.disabled = False
    button.disabled = False

select = pn.widgets.Select(options=['Just Testing'])
button = pn.widgets.Button(name='Process!')
button.on_click(callback)

pn.Column(select, button)

philippjfr commented:
It's down to this: #323
I think we need to add an eager argument to the watch mechanism, which ensures that this works.