fix: toFilePath with abs path in root

[KentoMoriwaki]

I'm working on a devcontainer where the workspace path is /workspace. (which is default when configured from vscode)

When I run vitest spec including expect(doc).toMatchInlineSnapshot(), the test is passed successfully but it fails to update snapshots. The error log is like below.

$ /workspace/node_modules/.bin/vitest run src/ui/consultationEditorV2/utils/convert.test.ts
Debugger attached.

 RUN  v0.15.2 /workspace

 ✓ src/ui/consultationEditorV2/utils/convert.test.ts (1)

Test Files  1 passed (1)
     Tests  1 passed (1)
      Time  6.03s (in thread 13ms, 46366.64%)

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Vitest caught 1 unhandled error during the test run. This might cause false positive tests.
Please, resolve all the errors to make sure your tests are not affected.

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Error: Errors occurred while running tests. For more information, see serialized error.
 ❯ Object.runTests node_modules/vitest/dist/chunk-vite-node-externalize.0ec89ad1.mjs:7089:17
 ❯ processTicksAndRejections node:internal/process/task_queues:96:5
 ❯ async file:/workspace/node_modules/vitest/dist/chunk-vite-node-externalize.0ec89ad1.mjs:10369:9
 ❯ Vitest.runFiles node_modules/vitest/dist/chunk-vite-node-externalize.0ec89ad1.mjs:10379:12
 ❯ Vitest.start node_modules/vitest/dist/chunk-vite-node-externalize.0ec89ad1.mjs:10306:5
 ❯ startVitest node_modules/vitest/dist/chunk-vite-node-externalize.0ec89ad1.mjs:11074:5
 ❯ start node_modules/vitest/dist/cli.mjs:666:9
 ❯ CAC.run node_modules/vitest/dist/cli.mjs:662:3

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Serialized Error: {
  "errors": [
    [Error: ENOENT: no such file or directory, open '/workspace/workspace/src/ui/consultationEditorV2/utils/convert.test.ts'],
  ],
}
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/workspace/workspace/src/ is a wrong path. the correct is /workspace/src/.
After debugging, I've found a bug in toFilePath function when given absolute path as id and root directry as base. And this will solve this problem.

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[sheremet-va]

Interesting, do you think this might also fix #1196 and #1534?

[KentoMoriwaki]

Both seems related, I think this solves those issues!