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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 It clearly shows it's dated or rather outdated.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
When highlighting, Fixed-size fonts and tabs are shown incorrectly, misaligned, and overwriting the text. Experienced on Ubuntu14/16, and quite hard to fix. Setting a different fixed-size font makes the problem. Can be a problem with the Gnome/KDE compatibility. See More
Doesn't show very small differences very clear (try to compare two termcap files with one letter difference) See More
So parts you don't want to see in your comparison can be hidden with ignore masks. Parts that are okay to be changed can be set with change-lists so Beyond Compare knows what's the replacement value and skips displaying this. So you can focus on the changes important for you. For example with the ignore mask you're able to compare two logs with different timestamps but nearly the same content (beginning with timestamps the first x characters adding to ignore). 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