This file contains a list of changes that can/must be done when
we break API/ABI for 3.x.


- Move GIMP_REPEAT_TRUNCATE to the start of the enum and rename it
  to NONE. Rename the current NONE to EXTEND or something.

- Add padding to all public class structs.

- Have private pointers in all public instance structs, not just
  GET_PRIVATE() macros, in order to inspect the private structs
  easily in the debugger.

- Remove compat values from all enums.