Work around #473: Hide tooltips in multiplayer

When you have both tooltips and the big score board, the tooltips erase
the score board in strange ways. Until we solve the root cause of those
drawing/undrawing races, let's hide the tooltips altogether during
multiplayer and when watching replays of multiplayer games.

src/game/core/game.d

@@ -296,6 +296,7 @@ private:
         // make the effect manager depend on what the GUI chooses.
         _effect = new EffectManager(determineLocalStyle(rp));
         nurse = new InteractiveNurse(level, rp, _effect);
+        // After the nurse has been created here, this.view() works.
 
         initializePanel();
         initializeMapAndRepEdit();
@@ -367,8 +368,13 @@ private:
             screenXlg - Tweaker.suggestedTweakerXlg, 20, From.BOTTOM_RIGHT));
         _mapClickExplainer = new TooltipLine(new Geom(0, 0,
             screenXlg - Tweaker.suggestedTweakerXlg, 20, From.TOP_RIGHT));
-        _panelExplainer.shown = opt.ingameTooltips.value;
-        _mapClickExplainer.shown = opt.ingameTooltips.value;
+
+        // Workaround for github #473: Tooltips and the big score board
+        // don't get along. For now, hide tooltips in modes with the board.
+        immutable bool github473
+            = opt.ingameTooltips.value && ! view.showScoreGraph;
+        _panelExplainer.shown = github473;
+        _mapClickExplainer.shown = github473;
         gui.addElder(_panelExplainer);
         gui.addElder(_mapClickExplainer);