fix: fix a memory leak bug, in measure for text actor

src/src/Rendering/Measure/EllipseAnnotationActor.cpp

@@ -142,6 +142,10 @@ EllipseAnnotationActor::~EllipseAnnotationActor() {
     controlP_rt = nullptr;
     controlP_lb = nullptr;
     controlP_rb = nullptr;
+    if (text) {
+        text->Delete();
+        text = nullptr;
+    }
 }
 
 void EllipseAnnotationActor::SetRenderer(vtkRenderer *ren) {

src/src/Rendering/Measure/OpenPolyAnnotationActor.cpp

@@ -140,6 +140,11 @@ OpenPolyAnnotationActor::~OpenPolyAnnotationActor() {
         p->Delete();
     });
     controlPointList.clear();
+    if (text)
+    {
+        text->Delete();
+        text=nullptr;
+    }
 }
 
 void OpenPolyAnnotationActor::selfDragCb(vtkObject *, unsigned long event, void *data) {

src/src/Rendering/Measure/RoundAnnotationActor.cpp

@@ -153,6 +153,10 @@ RoundAnnotationActor::~RoundAnnotationActor() {
     controlP_rt = nullptr;
     controlP_lb = nullptr;
     controlP_rb = nullptr;
+    if (text) {
+        text->Delete();
+        text = nullptr;
+    }
 }
 
 void RoundAnnotationActor::SetRenderer(vtkRenderer *ren) {