Fix #13107 (#13682)

Introduce a signal slot for tree item highlight change.

src/Gui/Tree.cpp

@@ -223,6 +223,7 @@ public:
     Connection connectIcon;
     Connection connectTool;
     Connection connectStat;
+    Connection connectHl;
 
     DocumentObjectData(DocumentItem* docItem, ViewProviderDocumentObject* vpd)
         : docItem(docItem)
@@ -236,6 +237,8 @@ public:
             std::bind(&DocumentObjectData::slotChangeToolTip, this, sp::_1));
         connectStat = viewObject->signalChangeStatusTip.connect(
             std::bind(&DocumentObjectData::slotChangeStatusTip, this, sp::_1));
+        connectHl = viewObject->signalChangeHighlight.connect(
+            std::bind(&DocumentObjectData::slotChangeHighlight, this, sp::_1, sp::_2));
         //NOLINTEND
 
         removeChildrenFromRoot = viewObject->canRemoveChildrenFromRoot();
@@ -359,6 +362,11 @@ public:
         for (auto item : items)
             item->setStatusTip(0, tip);
     }
+
+    void slotChangeHighlight(bool set, Gui::HighlightMode mode) {
+        for (auto item : items)
+            item->setHighlight(set, mode);
+    }
 };
 
 // ---------------------------------------------------------------------------

src/Gui/ViewProvider.h

@@ -36,6 +36,7 @@
 #include <Base/BoundBox.h>
 #include <Base/Vector3D.h>
 
+#include "TreeItemMode.h"
 
 class SbVec2s;
 class SbVec3f;
@@ -359,6 +360,8 @@ public:
     boost::signals2::signal<void (const QString&)> signalChangeToolTip;
     /// signal on status tip change
     boost::signals2::signal<void (const QString&)> signalChangeStatusTip;
+    /// signal on highlight change
+    boost::signals2::signal<void (bool, Gui::HighlightMode)> signalChangeHighlight;
     //@}
 
     /** update the content of the ViewProvider

src/Gui/ViewProviderSuppressibleExtension.cpp

@@ -62,7 +62,7 @@ void ViewProviderSuppressibleExtension::extensionUpdateData(const App::Property*
         //update the tree item
         bool suppressed = ext->Suppressed.getValue();
         setSuppressedIcon(suppressed);
-        vp->getDocument()->signalHighlightObject(*vp, Gui::HighlightMode::StrikeOut, suppressed, owner, 0);
+        getExtendedViewProvider()->signalChangeHighlight(suppressed, Gui::HighlightMode::StrikeOut);
     }
 }