+ fix inconsistency problem after undo/redo

src/Mod/Sketcher/Gui/TaskDlgEditSketch.cpp

@@ -24,6 +24,7 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
+# include <boost/bind.hpp>
 #endif
 
 #include "TaskDlgEditSketch.h"
@@ -51,11 +52,28 @@ TaskDlgEditSketch::TaskDlgEditSketch(ViewProviderSketch *sketchView)
     Content.push_back(General);
     Content.push_back(Constraints);
     Content.push_back(Elements);
+
+    App::Document* document = sketchView->getObject()->getDocument();
+    connectUndoDocument =
+        document->signalUndo.connect(boost::bind(&TaskDlgEditSketch::slotUndoDocument, this, _1));
+    connectRedoDocument =
+        document->signalRedo.connect(boost::bind(&TaskDlgEditSketch::slotRedoDocument, this, _1));
 }
 
 TaskDlgEditSketch::~TaskDlgEditSketch()
 {
+    connectUndoDocument.disconnect();
+    connectRedoDocument.disconnect();
+}
 
+void TaskDlgEditSketch::slotUndoDocument(const App::Document& doc)
+{
+    const_cast<App::Document&>(doc).recomputeFeature(sketchView->getObject());
+}
+
+void TaskDlgEditSketch::slotRedoDocument(const App::Document& doc)
+{
+    const_cast<App::Document&>(doc).recomputeFeature(sketchView->getObject());
 }
 
 //==== calls from the TaskView ===============================================================

src/Mod/Sketcher/Gui/TaskDlgEditSketch.h

@@ -31,6 +31,9 @@
 #include "TaskSketcherElements.h"
 #include "TaskSketcherGeneral.h"
 #include "TaskSketcherMessages.h"
+#include <boost/signals.hpp>
+
+typedef boost::signals::connection Connection;
 
 namespace SketcherGui {
 
@@ -65,11 +68,17 @@ public:
     { return QDialogButtonBox::Close|QDialogButtonBox::Help; }
 
 protected:
-    ViewProviderSketch   *sketchView;
+    void slotUndoDocument(const App::Document&);
+    void slotRedoDocument(const App::Document&);
+
+protected:
+    ViewProviderSketch      *sketchView;
     TaskSketcherConstrains  *Constraints;
-    TaskSketcherElements *Elements;
+    TaskSketcherElements    *Elements;
     TaskSketcherGeneral     *General;
     TaskSketcherMessages    *Messages;
+    Connection connectUndoDocument;
+    Connection connectRedoDocument;
 };