Fix "trails" on dim lines when zoomed in

src/Mod/TechDraw/Gui/QGIDimLines.cpp

@@ -50,11 +50,21 @@ void QGIDimLines::draw()
 {
 }
 
+QRectF QGIDimLines::boundingRect() const
+{
+    return shape().boundingRect().adjusted(-2, -2, 2, 2);  //room for 0.5 line widths? needs Rez::guiX??
+//    return childrenBoundingRect().adjusted(-2,-2,2,2);
+}
+
 //probably don't need this paint
 void QGIDimLines::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     QStyleOptionGraphicsItem myOption(*option);
     myOption.state &= ~QStyle::State_Selected;
 
+//    painter->drawRect(boundingRect());          //good for debugging
+
     QGIPrimPath::paint (painter, &myOption, widget);
 }
+
+

src/Mod/TechDraw/Gui/QGIDimLines.h

@@ -41,6 +41,7 @@ class TechDrawGuiExport QGIDimLines : public QGIPrimPath
 
     enum {Type = QGraphicsItem::UserType + 175};
     int type() const { return Type;}
+    QRectF boundingRect() const;
 
 public:
     void draw();

src/Mod/TechDraw/Gui/QGIViewDimension.cpp

@@ -1268,8 +1268,9 @@ void QGIViewDimension::draw()
             ccwInner = false;
         }
 
-        double dimLineAdjust = Rez::guiX(QGIArrow::getOverlapAdjust(QGIArrow::getPrefArrowStyle(),
-                                                                   QGIArrow::getPrefArrowSize()));
+        //TODO: figure out the math for adjusting the arc so the tip doesn't overlap the arrowhead.
+//        double dimLineAdjust = Rez::guiX(QGIArrow::getOverlapAdjust(QGIArrow::getPrefArrowStyle(),
+//                                                                   QGIArrow::getPrefArrowSize()));
         QRectF  mappedRect = mapRectFromItem(datumLabel, datumLabel->boundingRect());
         lblCenter = Base::Vector3d(mappedRect.center().x(), mappedRect.center().y(), 0.0); 
 
@@ -1473,6 +1474,8 @@ void QGIViewDimension::paint ( QPainter * painter, const QStyleOptionGraphicsIte
     } else {
         setPens();
     }
+//    painter->drawRect(boundingRect());          //good for debugging
+
     QGIView::paint (painter, &myOption, widget);
     setPens();
 }
@@ -1589,4 +1592,10 @@ double QGIViewDimension::getDefaultTextVerticalOffset() const
     return textMult*Rez::guiX(vp->Fontsize.getValue()) + TextOffsetFudge;
 }
 
+QRectF QGIViewDimension::boundingRect() const
+{
+    return childrenBoundingRect().adjusted(-3,-3,3,3);
+}
+
+
 #include <Mod/TechDraw/Gui/moc_QGIViewDimension.cpp>

src/Mod/TechDraw/Gui/QGIViewDimension.h

@@ -130,12 +130,13 @@ class TechDrawGuiExport QGIViewDimension : public QGIView
 
     void setViewPartFeature(TechDraw::DrawViewDimension *obj);
     int type() const override { return Type;}
-
-    virtual void drawBorder() override;
-    virtual void updateView(bool update = false) override;
+    QRectF boundingRect() const;
     virtual void paint( QPainter * painter,
                         const QStyleOptionGraphicsItem * option,
                         QWidget * widget = 0 ) override;
+
+    virtual void drawBorder() override;
+    virtual void updateView(bool update = false) override;
     virtual QColor getNormalColor(void) override;
     QString getLabelText(void);
 

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -1058,6 +1058,16 @@ QRectF QGIViewPart::boundingRect() const
     return QGIView::boundingRect();
 }
 
+void QGIViewPart::paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget) {
+    QStyleOptionGraphicsItem myOption(*option);
+    myOption.state &= ~QStyle::State_Selected;
+
+//    painter->drawRect(boundingRect());          //good for debugging
+
+    QGIView::paint (painter, &myOption, widget);
+}
+
+
 //QGIViewPart derived classes do not need a rotate view method as rotation is handled on App side.
 void QGIViewPart::rotateView(void)
 {

src/Mod/TechDraw/Gui/QGIViewPart.h

@@ -51,6 +51,9 @@ class TechDrawGuiExport QGIViewPart : public QGIView
 
     enum {Type = QGraphicsItem::UserType + 102};
     int type() const override { return Type;}
+    virtual void paint( QPainter * painter,
+                        const QStyleOptionGraphicsItem * option,
+                        QWidget * widget = 0 ) override;
 
 
     void toggleCache(bool state) override;