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Fix traceback in threads when SetTrace used. #2075

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Fix traceback in threads when SetTrace used. #2075

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6 changes: 3 additions & 3 deletions src/core/IronPython/Runtime/PythonContext.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3848,9 +3848,9 @@ public PythonTracebackListenersDispatcher(PythonContext parent) {
void Debugging.ITraceCallback.OnTraceEvent(Debugging.TraceEventKind kind, string name, string sourceFileName, SourceSpan sourceSpan, Func<IDictionary<object, object>> scopeCallback, object payload, object customPayload) {
var listener = _parent._tracebackListeners.Value;

if (listener == null && _parent.PythonOptions.Tracing) {
// If tracing without sys.set_trace() is enabled, we need to register a dummy traceback listener,
// because of the FunctionStack handling done there.
if (listener == null && (_parent.PythonOptions.Tracing || _parent._tracebackListenersCount > 0)) {
// If tracing is enabled (globally or via SetTrace on any thread), we need to register a dummy
// traceback listener for this thread, because of the FunctionStack handling done there.
_parent._tracebackListeners.Value = listener = new PythonTracebackListener(_parent, null);
}

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