History view shows wrong file list for root changeset (revision 0)

Created originally on Bitbucket by colin-hurley (Colin Hurley)

Environment

• Mercurial 4.2.2
• Eclipse RCP Neon 3
• MercurialEclipse 2.4.1.201711121153

Steps to reproduce

This issue can be reproduced with most repositories.

• Right-click the project and select Team > History
• Select changeset 0

Expected behavior

The history view should display the list of changes in chageset 0 (as with hg status --change 0)

Actual behavior

The history view displays an incorrect list of changes.

Workaround

From the command line, execute hg status --change 0 to show the correct list of changes for the root changeset.

Other thoughts

After debugging the code, the problem appears to be how MercurialEclipse gets the status for revision 0 (which is a "root" changeset - a changeset without any parents). All other revisions in the repository have at least one parent revision, so MercurialEclipse executes e.g. hg status --rev 0 --rev 1 to get the list of changes in revision 1. For revision 0, MercurialEclipse executes hg status --rev 0, which compares revision 0 against the working tree instead. So, the history view will actually show a different list of changes for revision 0 depending on which changeset is currently the parent of the working tree.

At any rate, changing MercurialEclipse to use hg status --change ... instead of hg status --rev ... for root changesets should remedy this problem.