From 7f3b40a9ca59bd1e3e7add127d380528d80a4642 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 27 Jan 2018 17:08:49 +0100
Subject: [PATCH] fix crash when deleting constraint

---
 src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp b/src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp
index a6d88f352d..c1f65adfae 100644
--- a/src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp
+++ b/src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp
@@ -769,10 +769,6 @@ void TaskSketcherConstrains::slotConstraintsChanged(void)
 
         it->ConstraintNbr = i;
         it->value = QVariant();
-        
-        ui->listWidgetConstraints->blockSignals(true);
-        it->updateVirtualSpaceStatus();
-        ui->listWidgetConstraints->blockSignals(false);
     }
 
     /* Remove entries, if any */
@@ -783,6 +779,14 @@ void TaskSketcherConstrains::slotConstraintsChanged(void)
     for (std::size_t i = ui->listWidgetConstraints->count(); i < vals.size(); ++i)
         ui->listWidgetConstraints->addItem(new ConstraintItem(sketch, sketchView, i));
 
+    /* Update the states */
+    ui->listWidgetConstraints->blockSignals(true);
+    for (int i = 0; i <  ui->listWidgetConstraints->count(); ++i) {
+        ConstraintItem * it = dynamic_cast<ConstraintItem*>(ui->listWidgetConstraints->item(i));
+        it->updateVirtualSpaceStatus();
+    }
+    ui->listWidgetConstraints->blockSignals(false);
+
     /* Update filtering */
     int Filter = ui->comboBoxFilter->currentIndex();
     for(std::size_t i = 0; i < vals.size(); ++i) {