Adjust point coordinates in wxDataViewCtrl::HitTest

Point coordinates passed from wxDataViewCtrl::HitTest() to wxDataViewMainWindow::HitTest()
should be converted from wxDataViewCtrl client coordinates to wxDataViewMainWindow client coordinates because they can different due to the presence of the header in wxDataViewCtrl client area.

docs/changes.txt

@@ -107,6 +107,7 @@ All (GUI):
 - Add wxEVT_STC_AUTOCOMP_COMPLETED event (NewPagodi).
 - Fix retrieving bounding box for wxDC with transformed coordinates.
 - Fix wxGraphicsMatrixData::Concat() for Direct2D and Cairo renderers.
+- Fix calculating point position in wxDataViewCtrl::HitTest().
 
 wxGTK:
 

interface/wx/dataview.h

@@ -1485,7 +1485,9 @@ public:
     bool HasSelection() const;
 
     /**
-        Hittest.
+        Retrieves item and column at the given point.
+        The point coordinates are specified in wxDataViewCtrl client area
+        coordinates.
     */
     virtual void HitTest(const wxPoint& point, wxDataViewItem& item,
                          wxDataViewColumn*& col) const;
@@ -2398,7 +2400,6 @@ public:
                           const wxDataViewItem & item,
                           unsigned int col);
 
-
 /**
         Override this to render the cell.
         Before this is called, wxDataViewRenderer::SetValue was called

src/generic/datavgen.cpp

@@ -5340,7 +5340,10 @@ void wxDataViewCtrl::EnsureVisible( const wxDataViewItem & item, const wxDataVie
 void wxDataViewCtrl::HitTest( const wxPoint & point, wxDataViewItem & item,
                               wxDataViewColumn* &column ) const
 {
-    m_clientArea->HitTest(point, item, column);
+    // Convert from wxDataViewCtrl coordinates to wxDataViewMainWindow coordinates.
+    // (They can be different due to the presence of the header.).
+    const wxPoint clientPt = m_clientArea->ScreenToClient(ClientToScreen(point));
+    m_clientArea->HitTest(clientPt, item, column);
 }
 
 wxRect wxDataViewCtrl::GetItemRect( const wxDataViewItem & item,