[PATCH 0/1] MR10348: ntdll: Avoid expensive inverted DST check on get_timezone_info() cache hit path

[Zhou Qiankang (＠wszqkzqk)]

inverted DST detection (two mktime() calls) out of the cache hit fast path in
get_timezone_info().

Keep the cache key based on the cheap raw bias value and only compute
inverted_dst/adjusted_bias on cache miss. Preserve the inverse DST correctness
fix by still applying adjusted_bias to tzi->Bias in the slow path.

This restores fast-path behavior for frequent GetTimeZoneInformation callers without regressing inverse DST handling.

Fixes regression: bfae6eb8b4f6 ("ntdll: Fix get_timezone_info() for timezones defined with inverse DST on Unix.")

Fixes: https://bugs.winehq.org/show_bug.cgi?id=59514

Signed-off-by: Zhou Qiankang <[e-mail]>

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https://gitlab.winehq.org/wine/wine/-/merge_requests/10348