Suppress assertions caused by closing the window while mouse is captured

Closing the window while dragging with unsaved changes causes a dialog box, triggering a capture-lost event. Closing the window while dragging without unsaved changes causes an assertion about destroying a window with mouse capture.

common/view/wx_view_controls.cpp

@@ -114,6 +114,8 @@ WX_VIEW_CONTROLS::WX_VIEW_CONTROLS( VIEW* aView, wxScrolledCanvas* aParentPanel
                             wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), NULL, this );
     m_parentPanel->Connect( wxEVT_SCROLLWIN_LINEDOWN,
                             wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), NULL, this );
+    m_parentPanel->Connect( wxEVT_MOUSE_CAPTURE_LOST,
+                            wxMouseEventHandler( WX_VIEW_CONTROLS::onCaptureLost ), NULL, this );
 
     m_cursorWarped = false;
 
@@ -128,6 +130,8 @@ WX_VIEW_CONTROLS::WX_VIEW_CONTROLS( VIEW* aView, wxScrolledCanvas* aParentPanel
 
 WX_VIEW_CONTROLS::~WX_VIEW_CONTROLS()
 {
+    if( m_parentPanel->HasCapture() )
+        m_parentPanel->ReleaseMouse();
 }
 
 
@@ -477,6 +481,10 @@ void WX_VIEW_CONTROLS::onLeave( wxMouseEvent& aEvent )
 
 }
 
+void WX_VIEW_CONTROLS::onCaptureLost( wxMouseEvent& aEvent )
+{
+   // This method must be present to suppress the capture-lost assertion
+}
 
 void WX_VIEW_CONTROLS::onTimer( wxTimerEvent& aEvent )
 {

include/view/wx_view_controls.h

@@ -64,6 +64,7 @@ public:
     void onLeave( wxMouseEvent& WXUNUSED( aEvent ) );
     void onTimer( wxTimerEvent& WXUNUSED( aEvent ) );
     void onScroll( wxScrollWinEvent& aEvent );
+    void onCaptureLost( wxMouseEvent& WXUNUSED( aEvent ) );
 
     /**
      * Enable or disable mouse cursor grabbing (limits the movement field only to the panel area).