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This idea is an alternative way to get a split view in Dolphin. Instead of creating a split view and the navigating one or both panes to a particular folder, you would have both folders open as tabs. Then you grab one tab and drag and drop it on the other tab. This would combine the two tabs into a split view (probably keeping the original dropped tab open). Similarly, you can drag a split view next to a tab to open it as a new tab.