Rather than two long replies side by side, you get a diff. Red marks what is only in the other pane, green marks what is only in this one, and everything the two share stays quiet. The disagreement is usually a small part of the text, and it is the part you need to decide on.
Compare two branches line by line
Choose Compare on any pane to set it against the main thread or another branch, and see exactly where the two answers differ.
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See it in the app: What's new under Help walks you through each update.
Open in GPTree