merge: additional test cases to show merge-halting behavior In the previous patches, we allowed the user to specify that a merge process should be halted when a filemerge fails. This patch adds tests that show additional places this logic can be utilized -- via the options to do additional post-filemerge checks to determine if a file merge was successful. Differential Revision: https://phab.mercurial-scm.org/D952

rebase: add support to output nodechanges This patch adds support to rebase to show the changes in node once the rebase is complete. This will be extremely helpful for automation purposes and editors such as Nuclide. The output is a dictionary of predecessor hash as key and a list of successors' hashes. The successors one is a list as there can be many successors for a single predecessor in case of split and it will good to have a generic output format. This patch adds tests for the same. A new file is created for the patch as existing files related to rebase has their own purpose and there will be more formatter support coming for rebase in next cycle. Thanks to Jun for suggesting to use fm.data(). Differential Revision: https://phab.mercurial-scm.org/D1173