If I understand your question correctly - Cline and Roo both display diffs by using built-in VS Code components, while Cursor/Windsurf/Void have built their own custom UI to display diffs. Very small detail, and just a matter of preference.
It's about whether the tool can edit just a few lines of the file, or whether it needs to stream the whole file every time - in effect, editing the whole file even though the end result may differ by just a few lines.
I think editing just a part of the file is what Roo calls diff editing, and I'm asking if this is what the person above means by line edits.
