The Angular compiler has an emulation system for various kinds of
filesystems and runs its testcases for all those filesystems. This
allows to verify that the compiler behaves correctly in all of the
supported platforms, without needing to run the tests on the actual
platforms.
Previously, the emulated Windows mode would normalize rooted paths to
always include a drive letter, whereas the native mode did not perform
this normalization. The consequence of this discrepancy was that running
the tests in native Windows was behaving differently compared to how
emulated Windows mode behaves, potentially resulting in test failures
in native Windows that would succeed for emulated Windows.
This commit adds logic to ensure that paths are normalized equally for
emulated Windows and native Windows mode, therefore resolving the
discrepancy.
PR Close#31996
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