Vadim Zeitlin 549e0a59b1 Fix handling of single letter shares in UNC paths in wxFileName ...

This comes at the price of breaking compatibility and returning
"\\share" rather than just "share" from wxFileName::GetVolume() for the
UNC paths. This breakage seems justified because it is required in order
to allow application code to distinguish between paths "x:\foo" and
"\\x\foo", which was previously impossible as GetVolume() returned just
"x" in both cases.

Document this change, adjust the existing checks for the new GetVolume()
semantics and add a new test which passes now, but didn't pass before.

Closes #19255.

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2021-09-15 01:51:35 +01:00

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