Fix hg push and hg push -r sometimes creating new heads without --force. Fixing issue179. The algorithm checks if there not more new heads on the remote side than heads which become non-heads due to getting children. Pushing this repo: m /\ 3 3a| |/ / 2 2a |/ 1 to a repo only having 1, 2 and 3 didn't abort requiring --force before. Added test cases for this and some doc strings for used methods.

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#!/bin/sh

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set -e

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mkdir test

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cd test

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echo foo>foo

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hg init

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hg addremove

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hg commit -m "1"

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hg verify

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hg clone . ../branch

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cd ../branch

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hg co

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echo bar>>foo

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hg commit -m "2"

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cd ../test

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hg pull ../branch

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hg verify

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hg co

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cat foo

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hg manifest