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This avoids a pseudo infinite loop where CodeWidget::UpdateCallstack would lock the CPU in order to read the call stack, causing the CPU to call Host_UpdateDisasmDialog because it's transitioning from running to pausing, causing Host::UpdateDisasmDialog to be emitted, causing CodeWidget::Update to be called, once again causing CodeWidget::UpdateCallstack to be called, repeating the cycle. Dolphin didn't go completely unresponsive during this, because Host_UpdateDisasmDialog schedules the emitting of Host::UpdateDisasmDialog to happen on another thread without blocking, but it was stopping certain operations like exiting emulation from working.