Black box: the queries of the user's train worked out once a read, lights as the driver checks them

- The stations, the signals passed, the horn points, the couplings, the
  consists and the timetable progress of the user's train are kept until
  a read adds something; the views asked for them every frame, which on
  a long session with many trains took the window down. A read that adds
  nothing no longer counts as a change.
- The lights are checked against the lamps the vehicles at the ends have
  (written by the simulator from now on), as its driver checks them: Pc 1
  without the upper headlight, with the auxiliary lamps, Pc 5 with the
  rear-end signals. Only while the user drives: the autopilot's lights
  are its own.
- A train off the platform counts at both ends: its head past the stop
  point as well as its tail before the platform's end.
- A recording without the couplings keeps the timetable for any vehicle
  of the user.
- A signal passed at danger is ringed on the map only once it was.
- In the tapes window a black box opens on a click or Enter, not when
  the arrow keys go over it.
- The viewer's screenshot of a window not laid out saves nothing and
  still closes.

Eu07.BlackBox.Views/CabPanel.cs

@@ -130,19 +130,20 @@ public sealed class CabPanel : Control
         double lightsX = Pad + 3 * third + 4;
         context.DrawText(MapView.Text(Strings["CabLights"], Palette.DimText, 10), new Point(lightsX, top));
         double faceX = lightsX;
-        foreach (var (key, lights, required) in new[]
+        foreach (var (key, lights, required, right) in new[]
                  {
-                     ("CabLightsHead", s.LightsHead, HeadCodes.RequiredHead(s)),
-                     ("CabLightsTail", s.LightsTail, HeadCodes.RequiredTail(s))
+                     ("CabLightsHead", s.LightsHead, HeadCodes.RequiredHead(s), HeadCodes.HeadRight(s)),
+                     ("CabLightsTail", s.LightsTail, HeadCodes.RequiredTail(s), HeadCodes.TailRight(s))
                  })
         {
             DrawFace(context, lights, new Point(faceX + 18, top + 24));
-            // the end, and the signal it shows: green as it is to be, red otherwise with the one it is to show
+            // the end, and the signal it shows: green as it is to be (with the lamps the vehicle has), red otherwise
+            // with the one it is to show
             var shown = HeadCodes.Of(lights);
-            var text = required is { } want && want != shown
+            var text = right == false && required is { } want
                 ? $"{HeadCodes.Name(shown)} ≠ {HeadCodes.Name(want)}"
-                : HeadCodes.Name(shown);
-            var brush = required is null ? Palette.FaintText : required == shown ? Palette.Good : Palette.Bad;
+                : right == true && required is { } met ? HeadCodes.Name(met) : HeadCodes.Name(shown);
+            var brush = right is null ? Palette.FaintText : right.Value ? Palette.Good : Palette.Bad;
             var label = MapView.Text($"{Strings[key]} {text}", brush, 9);
             context.DrawText(label, new Point(faceX + 18 - label.Width / 2, top + 34));
             faceX += 62;