Issue #351 constraint is not applied on preselected segments

The reason: lost selection of the circle center.
The decision: do not perform redisplay the AIS presentation in the AIS_InteractiveContext(displayer) if the shapes are equal. Here the GeomAPI realisation is necessary. The TopoDS_Shape realisation of the isEqual method is not enough because different TShapes instances are created and isEqual returns false.
A correction in the widget shape selector to avoid the distance presentation update by set an object(before set an attribute). In the previous version, the distance was jumped by selecting two points on lines. The reason is the distance calculation between point-object by setObject and after that point-point by setAttr

diff --git a/src/PartSet/PartSet_WidgetShapeSelector.cpp b/src/PartSet/PartSet_WidgetShapeSelector.cpp
index c8b8112fe01861ca9a96892992587c117ffc3d8d..86137696a5b3ee3751119d125c495eb4767e36d2 100644 (file)
--- a/src/PartSet/PartSet_WidgetShapeSelector.cpp
+++ b/src/PartSet/PartSet_WidgetShapeSelector.cpp
@@ -40,6 +40,10 @@ bool PartSet_WidgetShapeSelector::storeValue() const
       if (aRefAttr) {
         TopoDS_Shape aShape = myShape->impl<TopoDS_Shape>();
         AttributePtr aPntAttr = PartSet_Tools::findAttributeBy2dPoint(mySelectedObject, aShape, mySketch);
+        // this is an alternative, whether the attribute should be set or object in the attribute
+        // the first check is the attribute because the object already exist
+        // the object is set only if there is no selected attribute
+        // test case is - preselection for distance operation, which contains two points selected on lines
         if (aPntAttr)
           aRefAttr->setAttr(aPntAttr);
         else if (mySelectedObject)