Code review comment for lp:~alan-griffiths/mir/more-surface-resize

I think the majority view is that this API is fine.

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But we may need another MP to add a bunch of "reset" functions for surface properties that can be set.

Or, alternatively, have some values that give default behavior:

  mir_surface_default_min_width = 0,
  mir_surface_default_width_inc = 1,
  mir_surface_default_aspect_x = 0,
  etc.