Inline-Diff with Git/SVN/...
Jim Kingdon commented
Definitely a nice feature which I use regularly. Rubymine has something similar (clicking on the indicator has additional functionality in both netbeans and rubymine, if memory serves, although just green/blue/red would also be useful)
Netbeans has a nice feature i would like to see in Redcar: If you use it together with Git or SVN, it displays an inline diff to the base version while editing a file. At the beginning of each line, a green (for added lines), blue (for modified lines) or red (for deleted lines) marker is displayed.