icasefs: ignore removed files at building "dirstate._foldmap" up on icasefs
Before this patch, all files in dirstate are used to build "_foldmap"
up on case insensitive filesystem regardless of their statuses.
For example, when dirstate contains both removed file 'a' and added
file 'A', "_foldmap" may be updated finally by removed file 'a'. This
causes unexpected status information for added file 'A' at "hg status"
invocation.
This patch ignores removed files at building "_foldmap" up on case
insensitive filessytem.
This patch doesn't add any test, because this issue is difficult to
reproduce intentionally: it depends on iteration order of "dirstate._map".
Mercurial
=========
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