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If a file has a merge conflict we want it to show up in the 'Changed But Not Updated' file list rather than the 'Changes To Be Committed' file list. This way the user can mostly ignore the left side (the HEAD<->index comparsion) while resolving a merge and instead focus on the merge conflicts, which are just shown on the right hand side. This requires detecting the U state in the index side and drawing it as though it were _, then forcing the working directory side to have a U state. We have to delay this until presentation time as we don't want to change our internal state data to be different from what Git is telling us (I tried, the patch for that was ugly and didn't work). When showing a working directory diff and its a merge conflict we don't want to use diff-files as this would wind up showing any automatically merged hunks obtained from MERGE_HEAD in the diff. These are not usually very interesting as they were completed by the system. Instead we just want to see the conflicts. Fortunately the diff porcelain-ish frontend (aka 'git diff') detects the case of an unmerged file and generates a --cc diff against HEAD and MERGE_HEAD. So we now force any working directory diff with an index state of 'U' to go through that difference path. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>