largefiles: fix an explicit largefile commit after a remove (issue4969)
The change in b68797f244e4 to handle a normal -> largefile switch was too
aggressive in preserving the original matcher names. If a largefile is
explicitly provided by the user, but only the standin exists in dirstate, then
only the standin can be committed.
There's still maybe an issue when the largefile is deleted outside of Mercurial:
$ rm large
$ hg ci -m "oops" large
large: The system cannot find the file specified
nothing changed
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Test update logic when there are renames
Update with local changes across a file rename
$ hg init
$ echo a > a
$ hg add a
$ hg ci -m a
$ hg mv a b
$ hg ci -m rename
$ echo b > b
$ hg ci -m change
$ hg up -q 0
$ echo c > a
$ hg up
merging a and b to b
warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
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