Selects all actions that are potentially supported by the destination.
When calling this function, do not restrict the passed in actions to the ones provided by [[email protected]_actions]. Those actions may change in the future, even depending on the actions you provide here.
The preferred action is a hint to the drag-and-drop mechanism about which action to use when multiple actions are possible.
This function should be called by drag destinations in response to gdk_drag_enter or gdk_drag_motion events. If the destination does not yet know the exact actions it supports, it should set any possible actions first and then later call this function again.
| this |
a `GdkDrop` |
| actions |
Supported actions of the destination, or 0 to indicate that a drop will not be accepted |
| preferred |
A unique action that's a member of |