lazyancestors: reuse __iter__ implementation in __contains__
There was a comment in the code that said "Trying to do both __iter__
and __contains__ using the same visit heap and seen set is complex
enough that it slows down both. Keep them separate.". However, it
seems easy and efficient to make __contains__ keep an iterator across
calls.
I couldn't measure any slowdown from `hg bundle --all` (which seem to
call lazyancestors.__contains__ frequently).
Differential Revision: https://phab.mercurial-scm.org/D4508
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}