Fix nested lists disabling list mode.

Lists can't contain lists at runtime, but they can at parse time, so the optimizer must behave properly when handling nested lists. And it didn't, because it neglected to preserve the previous state of self.listmode. So we fix that.

lslopt/lsloutput.py

@@ -150,21 +150,23 @@ class outscript(object):
             if value == []:
                 return '[]'
             if len(value) < 5:
+                save_listmode = self.listmode
                 self.listmode = True
                 ret = '[' + self.Value2LSL(value[0])
                 for elem in value[1:]:
                     ret += ', ' + self.Value2LSL(elem)
                 ret += ']'
-                self.listmode = False
+                self.listmode = save_listmode
                 return ret
             ret = '' if lslcommon.IsCalc else '\n'
             first = True
             self.indentlevel += 1
             for entry in value:
                 ret += self.dent() + ('[ ' if first else ', ')
+                save_listmode = self.listmode
                 self.listmode = True
                 ret += self.Value2LSL(entry) + '\n'
-                self.listmode = False
+                self.listmode = save_listmode
                 first = False
             self.indentlevel -= 1
             return ret + self.dent() + self.indent + ']'