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Ell authored
In gegl_buffer_create_sub_buffer(), always return a new buffer object, even when the requested extent is equal to the input extent, instead of just reffing the input buffer in this case. This makes sure that (non-content-related) changes to the original buffer don't affect the sub-buffer. Adapt operations that use gegl_buffer_create_sub_buffer(), and for which this distinction is irrelevant, to explicitly ref the origianl buffer when the bounds are equal, instead of creating a sub-buffer.