workingfilectx: always use the same filelog, even for renames workingfilectx() was using the "src" filelog in case the file was renamed in the working copy. For consistency, stop special-casing it. This allows us to remove some duplication between filectx and workingfilectx.

use 'x is None' instead of 'x == None' The built-in None object is a singleton and it is therefore safe to compare memory addresses with is. It is also faster, how much depends on the object being compared. For a simple type like str I get: | s = "foo" | s = None ----------+-----------+---------- s == None | 0.25 usec | 0.21 usec s is None | 0.17 usec | 0.17 usec

patch: simplify Boolean expression slightly The context variable is either True, False or None. Abbreviate it as C and we get the following truth table where the second column is the original expression and the third column is the new expression: C | C or C == None | C is not False True | True | True False | False | False None | True | True

mq: new method invalidate Introduce method invalidate (similar to dirstate and repo).

mq: only read files when needed use util.propertycache as in dirstate

tests: replace #...# syntax with {...}

match: use self.exact instead of lambda self.exact uses a set and does not need an extra copy of the files

dirstate: use quicker matchfn() instead of match() everywhere matchfn does the same as match(), but a direct "link"