[Core] Disable toggling visibility for objects

- VarSet
- Spreadsheet
- FEM objects

src/Gui/ViewProviderVarSet.cpp

@@ -37,6 +37,7 @@ PROPERTY_SOURCE(Gui::ViewProviderVarSet, Gui::ViewProviderDocumentObject)
 
 ViewProviderVarSet::ViewProviderVarSet()
 {
+    setToggleVisibility(ToggleVisibilityMode::NoToggleVisibility);
     sPixmap = "VarSet";
 }
 

src/Mod/Fem/Gui/ViewProviderAnalysis.cpp

@@ -101,6 +101,7 @@ PROPERTY_SOURCE(FemGui::ViewProviderFemAnalysis, Gui::ViewProviderDocumentObject
 
 ViewProviderFemAnalysis::ViewProviderFemAnalysis()
 {
+    setToggleVisibility(ToggleVisibilityMode::NoToggleVisibility);
     sPixmap = "FEM_Analysis";
 }
 

src/Mod/Fem/Gui/ViewProviderSolver.cpp

@@ -41,6 +41,7 @@ PROPERTY_SOURCE(FemGui::ViewProviderSolver, Gui::ViewProviderDocumentObject)
 
 ViewProviderSolver::ViewProviderSolver()
 {
+    setToggleVisibility(ToggleVisibilityMode::NoToggleVisibility);
     sPixmap = "FEM_SolverStandard";
 }
 

src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheet.cpp

@@ -50,7 +50,10 @@ using namespace Spreadsheet;
 
 PROPERTY_SOURCE(SpreadsheetGui::ViewProviderSheet, Gui::ViewProviderDocumentObject)
 
-ViewProviderSheet::ViewProviderSheet() = default;
+ViewProviderSheet::ViewProviderSheet()
+{
+    setToggleVisibility(ToggleVisibilityMode::NoToggleVisibility);
+}
 
 ViewProviderSheet::~ViewProviderSheet()
 {