In Window -> Preferences navigate to General -> Editors -> Text Editors -> Quick Diff and tick "Enable quick diff", "Show differences in overview ruler" and set "Use this reference source" to "Pristine SVN Copy".
You might also want to change the colors to match NetBeans (blue for Changes, green for Additions, red for Deletions).
Note that you'll probably need to restart Eclipse for this to take effect.
As you go on changing the code it will show your changes on the side ruler until you commit to SVN.
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