Support DisposalMethod::kRestorePrevious in MultiFrameCodec and fix the apng problem.

[toneyzeng]

Support DisposalMethod::kRestorePrevious in MultiFrameCodec and fix the apng problem.

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[flutter-dashboard]

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[toneyzeng]

% ../../flutter_macos_3.10.1-stable/flutter/bin/flutter doctor -v

[!] Flutter (Channel stable, 3.10.1, on macOS 13.2.1 22D68 darwin-x64, locale zh-Hans-CN)
• Flutter version 3.10.1 on channel stable at /Users/zengjh/git/offical-flutter/flutter_macos_3.10.1-stable/flutter
! Warning: flutter on your path resolves to /Users/zengjh/git/hummers/hummer_2.5.1.7/src/flutter/uc/flutter_sdk/bin/flutter, which is not inside your current Flutter SDK checkout at
/Users/zengjh/git/offical-flutter/flutter_macos_3.10.1-stable/flutter. Consider adding /Users/zengjh/git/offical-flutter/flutter_macos_3.10.1-stable/flutter/bin to the front of your path.
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision d3d8effc68 (2 days ago), 2023-05-16 17:59:05 -0700
• Engine revision b4fb112
• Dart version 3.0.1
• DevTools version 2.23.1
• If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[toneyzeng]

Here is the problem video 3.10 exists:

apng_problem.mp4

Here is the problem example:

apng-demo-toneyzeng.zip

[bdero]

Thanks! LGTM w\ nit about naming.

[toneyzeng]

after a more efficient solution

apng_ok.mp4

[bdero]

Looks great, thanks!