Currently, the versions filter is case-sensitive regardless of the
underlying OS. With this change, the filter becomes case-insensitive
everywhere, which is more user-friendly and makes it easier to search
for files whose exact case the user may not remember.
In addition, forward and backslashes are no longer distinguished,
whether used as path separators or as part of a file / directory
name (which is unlikely but possible on some platforms).
Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>
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