merge with future 5.5 All was fine for 3.4.

merge future 5.5 There is a small limitation of split that does not clean up its working directory on failure otherwise all is fine.

merge with future 5.5 No extra change needed to get the test to passe with 3.6

merge with future 5.5 No extra new change are needed from the one needed from the 3.8 branch and previous version.

merge with future 5.5 Test also run on 3.8 with minor cosmetic change. The 'separate' function is not available before 3.9 so we had to drop it.

integrate code update and test change from future 5.5 code This prove that the code is compatible with 3.9

merge with default, Mercurial 4.0-rc is out The content of the Mercurial stable branch changed, we update it here too.