histedit: also update away from tmpnodes The working copy may be on a tmpnodes, we need to update away before it is stripped from the repository.

histedit: use revset to check if we need to update during abort The for loop is already quite more complicated than necessary and we are about to add some logic. Instead, we use a simple revset. Revset laziness should provide us with similar performance.

histedit: remove useless 'else' clause This 'else: pass' clause have no effect. We drop it for clarity.