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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#

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mkdir t

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cd t

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hg init

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echo 0 > a

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echo 0 > b

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hg ci -A -m m -d "1000000 0"

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hg rm a

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hg cat a

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sleep 1 # make sure mtime is changed

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echo 1 > b

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hg ci -m m -d "1000000 0"

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echo 2 > b

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hg cat -r 0 a

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hg cat -r 0 b

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hg cat -r 1 a

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hg cat -r 1 b