RFR: 8351913: ToolkitImage renders some gifs wrong [v7]

[Jeremy Wood]

> I do not have much background in LZW compression or in C, but I'm reasonably confident this resolves the problem I'm observing. It looks like the GifImageDecoder was not always correctly handling compression codes after the table reached its limit of ~4096. If anyone has suggestions for improvements I'm happy to make adjustments.
> 
> Luckily while debugging this: I was able to compare the flawed implementation (GifImageDecoder) with ImageIO's implementation (GIFImageReader) to help identify how the suffix/prefix tables are supposed to work.
> 
> ImageIO's implementation may have suffered a similar bug (maybe https://bugs.openjdk.org/browse/JDK-7131823 ?), and that appears to have been backported.
> 
> There are a cluster of four related PRs that share the GifComparison class in this PR.
> 
> 1. [8357034](https://github.com/openjdk/jdk/pull/25264)
> 2. ~~[8356137](https://github.com/openjdk/jdk/pull/25044)~~ (integrated)
> 3. [8356320](https://github.com/openjdk/jdk/pull/25076)
> 4. [8351913](https://github.com/openjdk/jdk/pull/24271) (this one)
> 
> This bug can be observed reading these gif animations:
> https://pixabay.com/gifs/pattern-mandela-geometric-loading-20162/
> https://pixabay.com/gifs/colourful-paint-spiral-pattern-20276/
> https://pixabay.com/gifs/dance-party-dancer-dancing-girl-19993/
> https://pixabay.com/gifs/spiral-orbit-colourful-pattern-20278/
> https://pixabay.com/gifs/flower-smiley-happy-yellow-bright-11997/
> https://pixabay.com/gifs/ghost-spooky-halloween-horror-20223/
> https://pixabay.com/gifs/fish-tadpole-sperm-decorative-20078/
> https://pixabay.com/gifs/cat-kitten-black-cats-sleep-nap-20104/
> https://giphy.com/gifs/party-gzhreEYEFrEYw
> https://giphy.com/gifs/hello-happy-birthday-all-xRVUlSCqTTZRLMdUiC
> https://giphy.com/gifs/GpANv0ZGOo973DNPyg
> https://giphy.com/gifs/pinatafarmsapp-birthday-happy-pinata-farms-rrmf3fICPZWg1MMXOW
> https://pixabay.com/gifs/stars-twinkle-sky-universe-cosmos-13910/
> https://pixabay.com/gifs/laundry-washing-clean-clothes-18875/
> https://giphy.com/gifs/cat-white-mikitti-VItynXR1BzF5z0aTM7
> https://giphy.com/gifs/love-good-morning-cute-sTuKV3kHCkuc1hzd5C
> https://giphy.com/gifs/tv2norge-dance-celebration-birthday-duNowzaVje6Di3hnOu
> https://tenor.com/view/hasher-sticker-gif-24531859
> https://giphy.com/gifs/animanias-emoji-mickey-mouse-minnie-BeiTtDrExJZsoHzglJ
> https://giphy.com/gifs/morning-good-gm-dvwk9tqWYN8Wn2s4yn
> https://giphy.com/gifs/memoriachilena-familia-memoria-chilena-patrimonio-cultural-comn-7rRmOg13aXImUOEhO7
> https://giphy.com/gifs/thegoodpla...

Jeremy Wood has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 33 commits:

 - 8351913: re-wrapping line breaks
 - Merge branch 'master' into JDK-8351913
   
   # Conflicts:
   #	test/jdk/sun/awt/image/gif/GifComparison.java
 - Merge branch 'master' into JDK-8351913
 - 8356137: Adding copyright to GifComparison
 - 8356320: trivial whitespace and comment changes
 - Merge branch 'master' into JDK-8351913
 - Merge branch 'master' of https://github.com/mickleness/jdk
 - 8351913: renaming class, rewording comment
   
   There's a cluster of 4 related gif tickets I intend to put in this /gif/ directory. I want to better clarify exactly what this test focuses on.
 - GifComparison: fixing error message
 - GifComparison: code cleanup
 - ... and 23 more: https://git.openjdk.org/jdk/compare/a86dd56d...166a998b

-------------

Changes: https://git.openjdk.org/jdk/pull/24271/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24271&range=06
  Stats: 53 lines in 4 files changed: 47 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/24271.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24271/head:pull/24271

PR: https://git.openjdk.org/jdk/pull/24271