Do not attempt to decode iDAT chunks when image is fully decoded. #2926
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Prerequisites
Description
Fixes #2924
With the update to the chunk identification code in v3.1.8, now detects an invalid iDAT chunk containing 6 bytes of data immediately following the correct and complete data. validation code throws an exception in cases, as this information is considered critical.
The revised behavior now ensures an early return when an issue with zLib data arises after the complete decoding of pixel data.