Fix forever blocks with only one block not working

config.py

@@ -24,11 +24,15 @@
 
 # Enable terminal output
 # Set whether any output messages should be allowed.
-enableTerminalOutput = True
+enableTerminalOutput: bool = False
 
 # Enable debug messages
 # Set whether debug messages (messages to stderr) should be allowed.
-enableDebugMessages = True
+enableDebugMessages: bool = True
+
+# Enable Scratch Addons debugger logs
+# This allows projects using Scratch Addons to print messages to the console. Vanilla Scratch doesn't support it.
+showSALogs: bool = True
 
 # Max FPS
 # Set maximum frame rate. Most projects won't break, but they

scratch.py

@@ -241,6 +241,7 @@ def execute(block, s, keys=[]):
                 s.target.blocks[b].blockRan = False
             nextBlock = s.target.blocks[inputs["SUBSTACK"][1]]
             nb = s.target.blocks[inputs["SUBSTACK"][1]]
+            block.substack.add(nb.blockID)
             while nb.next and nb.next != block.blockID:
                 # TODO: Caution: Don't loop the program
                 nb.blockRan = False
@@ -252,12 +253,13 @@ def execute(block, s, keys=[]):
             nb.next = block.blockID
             return nextBlock
     elif opcode == "procedures_call":
-        if block.proccode == "​​log​​ %s":  # Scratch Addons log ()
-            print("PROJECT LOG:", block.getCustomInputValue(0), file=sys.stderr)
-        elif block.proccode == "​​warn​​ %s":  # Scratch Addons warn ()
-            print("PROJECT WARN:", block.getCustomInputValue(0), file=sys.stderr)
-        elif block.proccode == "​​error​​ %s":  # Scratch Addons error ()
-            print("PROJECT ERROR:", block.getCustomInputValue(0), file=sys.stderr)
+        if config.showSALogs:
+            if block.proccode == "​​log​​ %s":  # Scratch Addons log ()
+                print("PROJECT LOG:", block.getCustomInputValue(0), file=sys.stderr)
+            elif block.proccode == "​​warn​​ %s":  # Scratch Addons warn ()
+                print("PROJECT WARN:", block.getCustomInputValue(0), file=sys.stderr)
+            elif block.proccode == "​​error​​ %s":  # Scratch Addons error ()
+                print("PROJECT ERROR:", block.getCustomInputValue(0), file=sys.stderr)
     else:
         print("Unknown opcode:", opcode)