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Bring up a context view grouped by context, select the desired context(s) in the sidebar, then click in right hand side and select all. Now right-click and select Focus in New Window and you've got a window focused on the projects that have at least one action from the selected contexts. You could make a temporary perspective ("Active projects with Steve and Martha") that retains the contents and update it as needed, but there's no way to specify a perspective that adjusts automatically.