zsh_completion: use revsets to exclude this rev from suggestions to hg merge
One of the most important aspects of a completion system is its speed, so 1
call to hg is definitely better than 4.
Sorting by rev (descending) is to preserve the same order as in `hg heads`
output.
While at it, declare branches as an array too.
Differential Revision: https://phab.mercurial-scm.org/D4426
{
// 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)
}