Raise ValueError when trying to access internal fp after close #6213
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Resolves #6205
The issue reported an unexpected error when calling
seek()after an image had been closed, thrown when trying to use__fp.This PR adds a
DeferredErrorbefore trying to access the internal fp, likeself.imdoes after an image is closed.Since this would be a further modification to
_close__fpin multiple plugins, this PR also renames__fpto_fp, making it accessible from Image.py, and allowing_close__fpto be merged into Image.py