Sets a property on the `GtkEditable` delegate for object.
This is a helper function that should be called in the `set_property` function of your `GtkEditable` implementation, before handling your own properties.
| object |
a `GObject` |
| prop_id |
a property ID |
| value |
value to set |
| pspec |
the `GParamSpec` for the property |
|
true if the property was found |