fix(ImageInput): incorrect IOProxy logic related to valid_file #4839
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Inside ImageInput::create(), there's a section where the created ImageInput tries to do a quick call to its valid_file() method to do an inexpensive check that the file appears to be the right file format corresponding to the ImageInput subclass. However, it always called the variety of valid_file() that takes a string filename, ignoring the fact that create() itself may have been passed an IOProxy, which should always take precedence over trying to open a real file.