Fix #1004

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
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• I have provided test coverage for my change (where applicable)

Description

Fixes #1004 Changes the behavior of the ZlibInflateStream to throw only when operating on a critical chunk.

[codecov]

Codecov Report

Merging #1005 into master will decrease coverage by 0.11%.
The diff coverage is 65.21%.

@@            Coverage Diff             @@
##           master    #1005      +/-   ##
==========================================
- Coverage   89.77%   89.66%   -0.12%     
==========================================
  Files        1098     1098              
  Lines       48810    48819       +9     
  Branches     3433     3438       +5     
==========================================
- Hits        43821    43772      -49     
- Misses       4284     4292       +8     
- Partials      705      755      +50

Impacted Files	Coverage Δ
...ts/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs	100% <ø> (ø)	⬆️
tests/ImageSharp.Tests/TestImages.cs	100% <ø> (ø)	⬆️
...c/ImageSharp/Formats/Png/Zlib/ZlibInflateStream.cs	57.97% <30%> (-0.5%)	⬇️
src/ImageSharp/Formats/Png/PngDecoderCore.cs	85.44% <92.3%> (-0.22%)	⬇️
...xelFormats/PixelOperations{TPixel}.PixelBenders.cs	89.9% <0%> (-10.1%)	⬇️
...olorSpaces/Conversion/ColorSpaceConverter.Adapt.cs	60% <0%> (-8.58%)	⬇️
...Processing/Processors/Transforms/TransformUtils.cs	87.64% <0%> (-6.75%)	⬇️
src/ImageSharp/Primitives/ValueSize.cs	78.94% <0%> (-5.27%)	⬇️
src/ImageSharp/Common/Helpers/ImageMaths.cs	82.05% <0%> (-5.13%)	⬇️
....Tests/TestUtilities/Tests/TestEnvironmentTests.cs	63.63% <0%> (-4.55%)	⬇️
... and 25 more

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[codecov]

Codecov Report

Merging #1005 into master will decrease coverage by <.01%.
The diff coverage is 71.79%.

@@            Coverage Diff             @@
##           master    #1005      +/-   ##
==========================================
- Coverage   89.86%   89.85%   -0.01%     
==========================================
  Files        1098     1098              
  Lines       48851    48863      +12     
  Branches     3428     3433       +5     
==========================================
+ Hits        43898    43908      +10     
- Misses       4252     4254       +2     
  Partials      701      701

Impacted Files	Coverage Δ
...ts/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs	100% <ø> (ø)	⬆️
tests/ImageSharp.Tests/TestImages.cs	100% <ø> (ø)	⬆️
...c/ImageSharp/Formats/Png/Zlib/ZlibInflateStream.cs	61.11% <52.38%> (+2.64%)	⬆️
src/ImageSharp/Formats/Png/PngDecoderCore.cs	85.65% <94.44%> (ø)	⬆️
...eSharp.Tests/Formats/Png/PngDecoderTests.Chunks.cs	100% <0%> (ø)	⬆️

---

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[antonfirsov]

Minor CQ related comment, but otherwise looks good. (My knowledge of PNG is limited though.)