BUG: Fixed bug 10382 - reset mouse button.

The mouse button variable was not always reset on release, causing weird
behavior in the vtkChartXY panning.

Charts/vtkContextScene.cxx

@@ -141,7 +141,7 @@ public:
 };
 
 //-----------------------------------------------------------------------------
-vtkCxxRevisionMacro(vtkContextScene, "1.14");
+vtkCxxRevisionMacro(vtkContextScene, "1.15");
 vtkStandardNewMacro(vtkContextScene);
 vtkCxxSetObjectMacro(vtkContextScene, AnnotationLink, vtkAnnotationLink);
 
@@ -390,8 +390,8 @@ void vtkContextScene::ButtonReleaseEvent(int button, int x, int y)
         event);
     this->Storage->items[this->Storage->itemMousePressCurrent]->MouseButtonReleaseEvent(event);
     this->Storage->itemMousePressCurrent = -1;
-    event.Button = -1;
     }
+  this->Storage->Event.Button = -1;
 }
 
 void vtkContextScene::MouseWheelEvent(int delta, int x, int y)