Fem: Prevent stop CalculiX immediately - fixes FreeCAD#12448

Author: marioalexis84

src/Mod/Fem/femtaskpanels/task_solver_ccxtools.py

@@ -98,15 +98,17 @@ def __init__(self, solver_object):
             QtCore.SIGNAL("clicked()"),
             self.editCalculixInputFile
         )
+        # connect stopCalculix before runCalculix
+        # see https://github.com/FreeCAD/FreeCAD/issues/12448
         QtCore.QObject.connect(
             self.form.pb_run_ccx,
             QtCore.SIGNAL("clicked()"),
-            self.runCalculix
+            self.stopCalculix
         )
         QtCore.QObject.connect(
             self.form.pb_run_ccx,
             QtCore.SIGNAL("clicked()"),
-            self.stopCalculix
+            self.runCalculix
         )
         QtCore.QObject.connect(
             self.form.rb_static_analysis,