Improve AfterEffects dialog parent handling on MacOS#65
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Clear stale dialog parent on engine shutdown and make get_dialog_parent more robust across platforms. On shutdown _DIALOG_PARENT is reset to avoid stale references. get_dialog_parent now imports QtCore, returns None on non-Windows (avoiding parenting to transient macOS windows), creates a persistent proxy window on Windows, and validates the cached parent by calling windowTitle() to detect deleted C++ objects and recreate the proxy if needed. Added debug logging to aid troubleshooting and prevent "Internal C++ object already deleted" errors.
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Clear stale dialog parent on engine shutdown and make get_dialog_parent more robust across platforms. On shutdown _DIALOG_PARENT is reset to avoid stale references. get_dialog_parent now imports QtCore, returns None on non-Windows (avoiding parenting to transient macOS windows), creates a persistent proxy window on Windows, and validates the cached parent by calling windowTitle() to detect deleted C++ objects and recreate the proxy if needed. Added debug logging to aid troubleshooting and prevent "Internal C++ object already deleted" errors.