Adds a button with the given text.
Clicking the button will emit the [[email protected]:GtkInfoBar:response
] signal with the given response_id. The button is
appended to the end of the info bars's action area. The button widget is returned, but usually you don't need it.
this |
a `GtkInfoBar` |
button_text |
text of button |
response_id |
response ID for the button |
the `GtkButton` widget that was added |