Issue a warning if "-r ." is used with two working directory parents. Rationale for not aborting instead: The first parent is usually more important as it is the local branch during a merge and commands like 'hg diff' and 'hg diff -r.' behave still identically (except for the warning of course). Added a test for log -r. with one and two parents.

     1

%% Should show unknown

     2

? unknown

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removing b

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%% Should show unknown and b removed

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R b

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? unknown

     7

%% Should show a and unknown

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a

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unknown