Fix extra aspects variable not being set for newly generated maps

src/genworld.cpp

@@ -34,6 +34,7 @@
 #include "string_func.h"
 #include "thread.h"
 #include "tgp.h"
+#include "signal_func.h"
 
 #include "safeguards.h"
 
@@ -312,6 +313,7 @@ void GenerateWorld(GenWorldMode mode, uint size_x, uint size_y, bool reset_setti
 
 	/* Load the right landscape stuff, and the NewGRFs! */
 	GfxLoadSprites();
+	InitialiseExtraAspectsVariable();
 	LoadStringWidthTable();
 
 	/* Re-init the windowing system */

src/signal.cpp

@@ -1467,7 +1467,7 @@ void UpdateAllSignalAspects()
 	}
 }
 
-void UpdateExtraAspectsVariable()
+static uint8 DetermineExtraAspectsVariable()
 {
 	uint8 new_extra_aspects = 0;
 
@@ -1481,6 +1481,12 @@ void UpdateExtraAspectsVariable()
 		}
 	}
 
+	return new_extra_aspects;
+}
+
+void UpdateExtraAspectsVariable()
+{
+	uint8 new_extra_aspects = DetermineExtraAspectsVariable();
 
 	if (new_extra_aspects != _extra_aspects) {
 		_extra_aspects = new_extra_aspects;
@@ -1488,3 +1494,8 @@ void UpdateExtraAspectsVariable()
 		MarkWholeScreenDirty();
 	}
 }
+
+void InitialiseExtraAspectsVariable()
+{
+	_extra_aspects = DetermineExtraAspectsVariable();
+}

src/signal_func.h

@@ -176,6 +176,7 @@ void UpdateAspectDeferred(TileIndex tile, Trackdir trackdir);
 void FlushDeferredAspectUpdates();
 void UpdateAllSignalAspects();
 void UpdateExtraAspectsVariable();
+void InitialiseExtraAspectsVariable();
 
 inline uint8 GetForwardAspectFollowingTrackAndIncrement(TileIndex tile, Trackdir trackdir)
 {