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compat: fix compatibility with upstream Mercurial

Manuel Jacob requested to merge topic/default/fix_compat_with_hg_3b7aabd02e11 into branch/default

Mercurial changeset 3b7aabd02e11 changed some code from repo[ctx.p1().node()] to ctx.p1(). ctx.p1() is using ctx._parents. The base class’s _parents returns instances of type changectx instead of overlaychangectx, leading to a crash later. Therefore we override _parents instead of parents().

The base class’s parents() method returns self._parents, so the return value of parents() is unchanged.

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