Allow 'set trace ignore' again. Undoes a change from 2005.

doc/UPDATES

@@ -1,6 +1,7 @@
 maint
   * Disable demo TCL support by default to prevent confusion during build.
   * Avoid apparmor ptrace(2) warnings on Ubuntu
+  * Allow 'set trace ignore' again. Undoes a change from 2005.
 
 1.4.5
   * Remove ahbl as it now positively identifies all hosts as abusive

src/shell.cc

@@ -268,15 +268,11 @@ static void got_sigtrap(int z)
 
 void check_trace(int start)
 {
-  if (trace == DET_IGNORE || trace == DET_WARN)
-    trace = DET_DIE;
-//    return;
-
 #ifdef DEBUG
-  trace = DET_IGNORE;
-#endif /* DEBUG */
+  return;
+#endif
 
-  if (trace == DET_IGNORE)
+  if (start == 0 && trace == DET_IGNORE)
     return;
 
   pid_t parent = getpid();