[Bug] docfx.Snapshots.Tests tests detect PDF diffs on non Ubuntu environment

[filzrev]

Describe the bug
When running docfx.Snapshots.Tests tests on Windows environment.
Snapshot diffs are detected that are relating to generated PDF files.

Expected behavior
docfx.Snapshots.Tests run successfully without diffs on Windows environment.

Context

• OS: Windows

Additional context

PDF snapshot diffs are caused by following OS dependent behaviors.

1. OS dependent fonts differences (Embedded fonts are selected by specified font family)
2. OS specific rendering differences. (See https://github.com/UglyToad/PdfPig/issues/840)

I've tried to use Web Fonts (Noto Sans and Noto Sans Mono) to resolve issues.
But 2. OS specific rendering differences seems to be hard to resolve. (It cause diffs on line break location)

As a temporary workaround.
I'm using following git commands to ignore diffs.

git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/api/toc.pdf.verified.json
git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/apipage/toc.pdf.verified.json
git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/articles/seed.pdf.verified.json
git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/md/toc.pdf.verified.json
git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/pdf/toc.pdf.verified.json
git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/restapi/toc.pdf.verified.json
git update-index --skip-worktree test/docfx.Snapshot.Tests/SamplesTest.Seed/toc.pdf.verified.json

Note

When reset above settings.
It need to exec command with --no-skip-worktree.
Skipped files can be found by using git ls-files -v command and S flag.