FEM: solver frame work, get rid of Active Document code

src/Mod/Fem/femsolver/calculix/tasks.py

@@ -118,7 +118,7 @@ class Results(run.Results):
             if femutils.is_of_type(m.Mesh, "Fem::FemMeshResult"):
                 self.analysis.Document.removeObject(m.Mesh.Name)
             self.analysis.Document.removeObject(m.Name)
-        FreeCAD.ActiveDocument.recompute()
+        self.analysis.Document.recompute()
 
     def load_results_ccxfrd(self):
         frd_result_file = os.path.join(

src/Mod/Fem/femsolver/calculix/writer.py

@@ -1381,7 +1381,7 @@ class FemInputWriterCcx(writerbase.FemInputWriter):
             time.ctime()
         ))
         f.write("**   file name     --> {}\n".format(
-            os.path.basename(FreeCAD.ActiveDocument.FileName)
+            os.path.basename(self.document.FileName)
         ))
         f.write("**   analysis name --> {}\n".format(
             self.analysis.Name

src/Mod/Fem/femsolver/elmer/equations/equation.py

@@ -58,7 +58,7 @@ class ViewProxy(equationbase.BaseViewProxy):
     def doubleClicked(self, vobj):
         if Gui.Control.activeDialog():
             Gui.Control.closeDialog()
-        Gui.ActiveDocument.setEdit(vobj.Object.Name)
+        vobj.Document.setEdit(vobj.Object.Name)
         return True
 
     def getTaskWidget(self, vobj):

src/Mod/Fem/femsolver/solverbase.py

@@ -115,7 +115,7 @@ class ViewProxy(object):
     def doubleClicked(self, vobj):
         if Gui.Control.activeDialog():
             Gui.Control.closeDialog()
-        Gui.ActiveDocument.setEdit(vobj.Object.Name)
+        vobj.Document.setEdit(vobj.Object.Name)
         return True
 
     def attach(self, vobj):

src/Mod/Fem/femsolver/writerbase.py

@@ -81,7 +81,7 @@ class FemInputWriter():
                 "Error: FemInputWriter has no working_dir --> "
                 "we are going to make a temporary one!\n"
             )
-            self.dir_name = FreeCAD.ActiveDocument.TransientDir.replace(
+            self.dir_name = self.document.TransientDir.replace(
                 "\\", "/"
             ) + "/FemAnl_" + analysis_obj.Uid[-4:]
         if not os.path.isdir(self.dir_name):

src/Mod/Fem/femsolver/z88/tasks.py

@@ -119,7 +119,7 @@ class Results(run.Results):
             if femutils.is_of_type(m.Mesh, "Fem::FemMeshResult"):
                 self.analysis.Document.removeObject(m.Mesh.Name)
             self.analysis.Document.removeObject(m.Name)
-        FreeCAD.ActiveDocument.recompute()
+        self.analysis.Document.recompute()
 
     def load_results_z88o2(self):
         disp_result_file = os.path.join(