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Wang, Xiong
c3548cd16a
Clear the argument tuple after calling a Python callback so varfunc's destructor cannot decrement it a second time. This prevents repeated zero-argument callbacks from losing references to the shared empty tuple. Skip callback reference cleanup after Python has shut down, since Qt can destroy pending callback closures during QApplication teardown. Validation: - Regression harness using this header and bundled Python 3.6.4: 20,000 callbacks with balanced references, nonempty arguments, exception paths, deferred release, and callback destruction after Py_Finalize. - Windows x64 Release build: no warnings or errors. - MI 8 remote replay: 1.rdc -> 2.rdc -> 1.rdc -> 2.rdc; normal exit with a pending callback, exit code 0. Build and device checks used the existing development checkout, which also contains separate local changes excluded from this commit.