Natural string compare function doesn't take into account that
the string can start with a number and in this case it treats it
like a conventional string compare. This change takes this case
into account.
This change also refactores the tests for NaturalStringSorter
class. The previous tet used a mock XBreakIterator and XCollator
implementations to test the functionallity. This is not needed as
we can just use a real one instead, which makes the test more
real as it actually uses a real implementation instead of a mock
implementation, which could differ. This change removes the mock
XCollator and XBreakIterator implementations and moves the test
into a new file - NaturalStringSortTest.cxx
The test is also extended with the new use case where the string
starts with a number.
Change-Id: I32ea055f914c2947e4d979093b32f56170a61102
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134540
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
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