'bzr status' stats each file multiple times

[Aaron Bentley]

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John A Meinel wrote:
| I have a rather large .bzrignore, because this project
| likes to build inside the tree. It's a rather large project with 1600
| source files, and about 50 output executables.
| So I think bzr is trying to match each file it finds against all entries
| in .bzrignore.

I don't know what it *is* doing, but it should only be checking
unversioned files against .bzrignore.

| Since a lot of them are absolute paths, I'm thinking bzr should use a
| dictionary for the absolute paths, then it can just say "is path in
| ignored_paths" rather than doing a fnmatchcase against each one. 50x500
| files takes a while.

Since absolute paths may have wildcards, that's not entirely right.  But
non-wildcard absolute paths are common, so it may be worthwhile to
optimize for them, as long as the external behavior doesn't change.

Aaron
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