view .arcconfig @ 35281:010179e21e91

context: switch ctx() use to changectx()

I added `ctx()` to `overlayworkingfilectx`, (and before that, `absentfilectx`),
because `absentfilectx` had reference to this function in its `cmp()` function.

But the standard is actually `changectx()`, and no other class implements
`ctx()`. So let's use the standard name.

(As a result, I'm not sure that part of the `absentfilectx` comparator ever
worked! It was written before I added either function.)

This will be necessary in the next patch.

Differential Revision: https://phab.mercurial-scm.org/D1211

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