Add option to disable rotation center indication

src/Gui/DlgSettingsNavigation.cpp

@@ -86,6 +86,7 @@ void DlgSettingsNavigation::saveSettings()
     ui->checkBoxZoomAtCursor->onSave();
     ui->checkBoxInvertZoom->onSave();
     ui->checkBoxDisableTilt->onSave();
+    ui->checkBoxShowRotationCenter->onSave();
     ui->spinBoxZoomStep->onSave();
     ui->checkBoxUseAutoRotation->onSave();
     ui->qspinNewDocScale->onSave();
@@ -122,6 +123,7 @@ void DlgSettingsNavigation::loadSettings()
     ui->checkBoxZoomAtCursor->onRestore();
     ui->checkBoxInvertZoom->onRestore();
     ui->checkBoxDisableTilt->onRestore();
+    ui->checkBoxShowRotationCenter->onRestore();
     ui->spinBoxZoomStep->onRestore();
     ui->checkBoxUseAutoRotation->onRestore();
     ui->qspinNewDocScale->onRestore();

src/Gui/DlgSettingsNavigation.ui

@@ -615,6 +615,25 @@ Mouse tilting is not disabled by this setting.</string>
         </property>
        </widget>
       </item>
+      <item row="9" column="0">
+       <widget class="Gui::PrefCheckBox" name="checkBoxShowRotationCenter">
+        <property name="toolTip">
+         <string>Show the rotation center when dragging.</string>
+        </property>
+        <property name="text">
+         <string>Enable rotation center indication</string>
+        </property>
+        <property name="checked">
+         <bool>true</bool>
+        </property>
+        <property name="prefEntry" stdset="0">
+         <cstring>ShowRotationCenter</cstring>
+        </property>
+        <property name="prefPath" stdset="0">
+         <cstring>View</cstring>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/Gui/PreferencePackTemplates/View.cfg

@@ -18,6 +18,7 @@
           <FCInt Name="CornerCoordSystemSize" Value="10"/>
           <FCBool Name="CheckBoxSelectionCheckBoxes" Value="1"/>
           <FCBool Name="InvertZoom" Value="1"/>
+          <FCBool Name="ShowRotationCenter" Value="1"/>
           <FCInt Name="NaviStepByTurn" Value="8"/>
           <FCText Name="NavigationStyle">Gui::CADNavigationStyle</FCText>
           <FCInt Name="OrbitStyle" Value="1"/>

src/Gui/View3DInventorViewer.cpp

@@ -1278,7 +1278,11 @@ void View3DInventorViewer::showRotationCenter(bool show)
     SoNode* scene = getSceneGraph();
     auto sep = static_cast<SoSeparator*>(scene);
 
-    if (show) {
+    bool showEnabled = App::GetApplication()
+                           .GetParameterGroupByPath("User parameter:BaseApp/Preferences/View")
+                           ->GetBool("ShowRotationCenter", true);
+
+    if (show && showEnabled) {
         SbBool found;
         SbVec3f center = navigation->getRotationCenter(found);