Do simulation in separate thread

Closes #181 (closed)

b_asic/GUI/main_window.py

@@ -86,6 +86,7 @@ class MainWindow(QMainWindow):
         self.sfg_dict = {}
         self._window = self
         self.logger = logging.getLogger(__name__)
+        self._plot: Dict[Simulation, PlotWindow] = dict()
 
         # Create Graphics View
         self.graphic_view = QGraphicsView(self.scene, self)
@@ -754,8 +755,8 @@ class MainWindow(QMainWindow):
             self._thread[sfg].start()
 
     def _show_plot_window(self, sim: Simulation):
-        self._plot = PlotWindow(sim.results, sfg_name=sim._sfg.name)
-        self._plot.show()
+        self._plot[sim] = PlotWindow(sim.results, sfg_name=sim._sfg.name)
+        self._plot[sim].show()
 
     def simulate_sfg(self, event=None) -> None:
         self._simulation_dialog = SimulateSFGWindow(self)