Rebase with collapse tries to open editor and hangs
Created originally on Bitbucket by mjacob (Manuel Jacob)
How to reproduce
Select two revisions to rebase (the source branch should contain more than one changeset). Select "Collapse the rebased changeset" option. Click "Rebase".
There should be a way to edit the changeset description of the resulting changeset.
Mercurial tries to open an editor and hangs.