fix blocking of SelectionObserver

src/Gui/Selection.cpp

@@ -53,7 +53,7 @@ FC_LOG_LEVEL_INIT("Selection",false,true,true)
 using namespace Gui;
 using namespace std;
 
-SelectionObserver::SelectionObserver() : blocker(connectSelection, false)
+SelectionObserver::SelectionObserver() : blockSelection(false)
 {
     attachSelection();
 }
@@ -65,17 +65,17 @@ SelectionObserver::~SelectionObserver()
 
 bool SelectionObserver::blockConnection(bool block)
 {
-    bool ok = connectSelection.blocked();
+    bool ok = blockSelection;
     if (block)
-        blocker.block();
+        blockSelection = true;
     else
-        blocker.unblock();
+        blockSelection = false;
     return ok;
 }
 
 bool SelectionObserver::isConnectionBlocked() const
 {
-    return connectSelection.blocked();
+    return blockSelection;
 }
 
 void SelectionObserver::attachSelection()
@@ -87,7 +87,9 @@ void SelectionObserver::attachSelection()
 }
 
 void SelectionObserver::_onSelectionChanged(const SelectionChanges& msg) {
-    try { 
+    try {
+        if (blockSelection)
+            return;
         onSelectionChanged(msg);
     } catch (Base::Exception &e) {
         e.ReportException();

src/Gui/Selection.h

@@ -147,7 +147,7 @@ private:
 private:
     typedef boost::signals2::connection Connection;
     Connection connectSelection;
-    boost::signals2::shared_connection_block blocker;
+    bool blockSelection;
 };
 
 /**