add_setter

Adds a setter to this.

The setter will automatically set property on object to value when applying the breakpoint, and set it back to its original value upon unapplying it.

Note that setting properties to their original values does not work for properties that have irreversible side effects. For example, changing [ property@Gtk.Button:label] while [property@Gtk.Button:icon-name] is set will reset the icon. However, resetting the label will not set icon-name to its original value.

Use the [signal@Breakpoint:AdwBreakpoint:apply] and [signal@Breakpoint:AdwBreakpoint:unapply] signals for those properties instead, as follows:

```c static void breakpoint_apply_cb (MyWidget *self) { gtk_button_set_icon_name (self->button, "go-previous-symbolic"); }

static void breakpoint_apply_cb (MyWidget *self) { gtk_button_set_label (self->button, _("_Back")); }

// ...

g_signal_connect_swapped (breakpoint, "apply", G_CALLBACK (breakpoint_apply_cb), self); g_signal_connect_swapped (breakpoint, "unapply", G_CALLBACK (breakpoint_unapply_cb), self); ```

Parameters:

this	a breakpoint
object	the target object
property	the target property
value	the value to set