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For modern version control systems, 3way merge support is a basic requirement, but many other open source diff viewers do not adequately handle 3way merges. KDiff uses a 4 panel system, showing Left, Right, Base (very important) at the bottom. The Base (common ancestor) panel is extremely helpful for complex merges where both Left and Right diverged significantly from their common ancestor. See More
4 sub-windows (when you really only need 3), a lot of different colors and even more confusing result-window. No links what has changed between versions and and the result. It clearly shows it's dated or rather outdated. Great if you ever need to do a command line merge, otherwise it sucks. See More
Doesn't show very small differences very clear (try to compare two termcap files with one letter difference) See More
P4Merge offers a 4 panel 3 way merge, where you can see how both Left and Right diverged from their common ancestor (middle panel) and the result is the bottom (4th) panel. The common ancestor is extremely useful for complex merges were both files have diverged significantly from their common ancestor and it's not obvious which side to take if you don't have a clear view of how they changed. See More
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