> exif.c parser should not be using EXIF tags during tiff directory search for EXIF tag.
+ > fix parsers to properly indicate which offsets are valid
+ instead of making one zero if the other is found, this leads to making
+ the file loader parse an entire file even if we found no jpeg but did find an exif segment.
+ (simply set non-found offsets to file length?)
+
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> work on pan view: