Clicking 1st detail panel tab when in form mode should not leave form
At the moment when clicking the 1st detail panel tab when in form mode switches back to info mode, causing unsaved changes being lost. What the user probably expects when clicking a tab which is selected already: nothing happens. So, clicking the 1st detail panel tab when in form mode should be a no-op. In the regard of #317 (closed) no "Unsaved Changes" warning should appear.