Fix crashing after a piece remove while rendering label.

src/app/valentina/xml/vpattern.cpp

@@ -4512,6 +4512,9 @@ void VPattern::PrepareForParse(const Document &parse)
 {
     SCASSERT(sceneDraw != nullptr)
     SCASSERT(sceneDetail != nullptr)
+
+    emit CancelLabelRendering();
+
     if (parse == Document::FullParse)
     {
         RefreshElementIdCache();

src/app/valentina/xml/vpattern.h

@@ -30,8 +30,8 @@
 #define VPATTERN_H
 
 #include "../ifc/xml/vabstractpattern.h"
-#include "../vpatterndb/vcontainer.h"
 #include "../ifc/xml/vpatternconverter.h"
+#include "../vpatterndb/vcontainer.h"
 
 class VMainGraphicsScene;
 class VNodeDetail;
@@ -45,6 +45,7 @@ class VToolSeamAllowance;
 class VPattern : public VAbstractPattern
 {
     Q_OBJECT // NOLINT
+
 public:
     VPattern(VContainer *data, VMainGraphicsScene *sceneDraw, VMainGraphicsScene *sceneDetail,
              QObject *parent = nullptr);
@@ -205,23 +206,20 @@ private:
                                           const Document &parse);
     void ParseToolPointOfIntersectionCircles(VMainGraphicsScene *scene, QDomElement &domElement, const Document &parse);
     void ParseToolPointOfIntersectionCurves(VMainGraphicsScene *scene, QDomElement &domElement, const Document &parse);
-    void ParseToolPointFromCircleAndTangent(VMainGraphicsScene *scene, QDomElement &domElement,
+    void ParseToolPointFromCircleAndTangent(VMainGraphicsScene *scene, QDomElement &domElement, const Document &parse);
-                                            const Document &parse);
     void ParseToolPointFromArcAndTangent(VMainGraphicsScene *scene, const QDomElement &domElement,
                                          const Document &parse);
     void ParseToolTrueDarts(VMainGraphicsScene *scene, const QDomElement &domElement, const Document &parse);
 
     // TODO. Delete if minimal supported version is 0.2.7
-    Q_STATIC_ASSERT_X(VPatternConverter::PatternMinVer < FormatVersion(0, 2, 7),
+    Q_STATIC_ASSERT_X(VPatternConverter::PatternMinVer < FormatVersion(0, 2, 7), "Time to refactor the code.");
-                      "Time to refactor the code.");
     void ParseOldToolSpline(VMainGraphicsScene *scene, QDomElement &domElement, const Document &parse);
 
     void ParseToolSpline(VMainGraphicsScene *scene, QDomElement &domElement, const Document &parse);
     void ParseToolCubicBezier(VMainGraphicsScene *scene, const QDomElement &domElement, const Document &parse);
 
     // TODO. Delete if minimal supported version is 0.2.7
-    Q_STATIC_ASSERT_X(VPatternConverter::PatternMinVer < FormatVersion(0, 2, 7),
+    Q_STATIC_ASSERT_X(VPatternConverter::PatternMinVer < FormatVersion(0, 2, 7), "Time to refactor the code.");
-                      "Time to refactor the code.");
     void ParseOldToolSplinePath(VMainGraphicsScene *scene, QDomElement &domElement, const Document &parse);
 
     void ParseToolSplinePath(VMainGraphicsScene *scene, const QDomElement &domElement, const Document &parse);

src/libs/ifc/xml/vabstractpattern.h

@@ -473,6 +473,8 @@ signals:
     void BackgroundImagePositionChanged(const QUuid &id);
     void BackgroundImageOpacityChanged(const QUuid &id);
 
+    void CancelLabelRendering();
+
 public slots:
     virtual void LiteParseTree(const Document &parse) = 0;
     void haveLiteChange();

src/libs/vtools/tools/vtoolseamallowance.cpp

@@ -395,6 +395,12 @@ auto RenderFoldLine(const VPiece &detail, const VContainer *data) -> VFoldLine
 }
 } // namespace
 
+//---------------------------------------------------------------------------------------------------------------------
+VToolSeamAllowance::~VToolSeamAllowance()
+{
+    CancelLabelRendering();
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 auto VToolSeamAllowance::Create(const QPointer<DialogTool> &dialog, VMainGraphicsScene *scene, VAbstractPattern *doc,
                                 VContainer *data) -> VToolSeamAllowance *
@@ -1734,6 +1740,7 @@ VToolSeamAllowance::VToolSeamAllowance(const VToolSeamAllowanceInitData &initDat
     connect(m_sceneDetails, &VMainGraphicsScene::EnableToolMove, this, &VToolSeamAllowance::EnableToolMove);
     connect(m_sceneDetails, &VMainGraphicsScene::ItemSelection, this, &VToolSeamAllowance::ToolSelectionType);
     connect(m_sceneDetails, &VMainGraphicsScene::UpdatePassmarks, this, &VToolSeamAllowance::UpdatePassmarks);
+    connect(doc, &VAbstractPattern::CancelLabelRendering, this, &VToolSeamAllowance::CancelLabelRendering);
 
     ConnectOutsideSignals();
 
@@ -1973,6 +1980,8 @@ void VToolSeamAllowance::SaveDialogChange(const QString &undoText)
     const VPiece newDet = dialogTool->GetPiece();
     const VPiece oldDet = VAbstractTool::data.GetPiece(m_id);
 
+    CancelLabelRendering();
+
     QVector<QPointer<VUndoCommand>> &undocommands = dialogTool->UndoStack();
     const bool groupChange = not undocommands.isEmpty();
 

src/libs/vtools/tools/vtoolseamallowance.h

@@ -55,7 +55,7 @@ class VToolSeamAllowance final : public VInteractiveTool, public QGraphicsPathIt
     Q_OBJECT // NOLINT
 
 public:
-    ~VToolSeamAllowance() override = default;
+    ~VToolSeamAllowance() override;
 
     static auto Create(const QPointer<DialogTool> &dialog, VMainGraphicsScene *scene, VAbstractPattern *doc,
                        VContainer *data) -> VToolSeamAllowance *;
@@ -122,7 +122,6 @@ public:
     auto boundingRect() const -> QRectF override;
     auto shape() const -> QPainterPath override;
 
-    void CancelLabelRendering();
 public slots:
     void FullUpdateFromGuiApply() override;
     void FullUpdateFromFile() override;
@@ -138,6 +137,8 @@ public slots:
     void UpdatePassmarks();
     void ShowOptions();
     void DeleteFromMenu();
+    void CancelLabelRendering();
+
 protected slots:
     void UpdateGrainline();
     void SaveMoveDetail(const QPointF &ptPos);