PVS-Studio warning V519 for wxWidgets

bool m_isDirty;
bool m_isShown;

bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot,
                                   wxWindow* window,
                                   bool fullScreen,
                                   wxRect* rect)
{
  ...
  m_isDirty = false;
  m_isDirty = false;
  ...
}

Most likely this is what should be written here: m_isShown = false;

This suspicious code was found in wxWidgets project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'm_isDirty' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 249, 250. core dragimgg.cpp 250

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/