(svn r17672) -Revert (r8081): 'last_value' and 'reseed' are shared between procedure and main chain.

-Fix (r8075): 'scope' and 'count' are not.

src/newgrf_spritegroup.cpp

@@ -142,13 +142,16 @@ const SpriteGroup *DeterministicSpriteGroup::Resolve(ResolverObject *object) con
 		/* Try to get the variable. We shall assume it is available, unless told otherwise. */
 		bool available = true;
 		if (adjust->variable == 0x7E) {
-			ResolverObject subobject = *object;
-			const SpriteGroup *subgroup = SpriteGroup::Resolve(adjust->subroutine, &subobject);
+			const SpriteGroup *subgroup = SpriteGroup::Resolve(adjust->subroutine, object);
 			if (subgroup == NULL) {
 				value = CALLBACK_FAILED;
 			} else {
 				value = subgroup->GetCallbackResult();
 			}
+
+			/* Reset values to current scope.
+			 * Note: 'last_value' and 'reseed' are shared between the main chain and the procedure */
+			object->scope = this->var_scope;
 		} else {
 			value = GetVariable(object, adjust->variable, adjust->parameter, &available);
 		}

src/newgrf_spritegroup.h

@@ -291,14 +291,16 @@ struct ResolverObject {
 	uint32 callback_param2;
 
 	byte trigger;
-	byte count;
-	uint32 last_value;
-	uint32 reseed;
-	VarSpriteGroupScope scope;
 
-	BaseStorageArray *psa; ///< The persistent storage array of this resolved object.
+	uint32 last_value;          ///< Result of most recent DeterministicSpriteGroup (including procedure calls)
+	uint32 reseed;              ///< Collects bits to rerandomise while triggering triggers.
+
+	VarSpriteGroupScope scope;  ///< Scope of currently resolved DeterministicSpriteGroup resp. RandomizedSpriteGroup
+	byte count;                 ///< Additional scope for RandomizedSpriteGroup
+
+	BaseStorageArray *psa;      ///< The persistent storage array of this resolved object.
 
-	const GRFFile *grffile; ///< GRFFile the resolved SpriteGroup belongs to
+	const GRFFile *grffile;     ///< GRFFile the resolved SpriteGroup belongs to
 
 	union {
 		struct {