Remove manual mirroring in RTL case from wxGrid code.

This is not necessary as wxDC already inherits RTL from the window itself and,
in fact, breaks the display when using RTL.

Closes #16250.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77037 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -603,6 +603,7 @@ wxMSW:
 - Fix background of wxRadioBox buttons and wxSlider (Artur Wieczorek).
 - Fix appearance of wxToggleButtons with non default colours (Artur Wieczorek).
 - Fix drawing on wxDC when using right-to-left layout (Artur Wieczorek).
+- Fix wxGrid appearance and behaviour in RTL (Artur Wieczorek).
 
 
 3.0.1: (released 2014-06-15)

src/generic/grid.cpp

@@ -1680,10 +1680,7 @@ void wxGridColLabelWindow::OnPaint( wxPaintEvent& WXUNUSED(event) )
     int x, y;
     m_owner->CalcUnscrolledPosition( 0, 0, &x, &y );
     wxPoint pt = dc.GetDeviceOrigin();
-    if (GetLayoutDirection() == wxLayout_RightToLeft)
-        dc.SetDeviceOrigin( pt.x+x, pt.y );
-    else
-        dc.SetDeviceOrigin( pt.x-x, pt.y );
+    dc.SetDeviceOrigin( pt.x-x, pt.y );
 
     wxArrayInt cols = m_owner->CalcColLabelsExposed( GetUpdateRegion() );
     m_owner->DrawColLabels( dc, cols );
@@ -3736,13 +3733,9 @@ void wxGrid::ProcessColLabelMouseEvent( wxMouseEvent& event )
 
                     // and check if we're on the "near" (usually left but right
                     // in RTL case) part of the column
-                    bool onNearPart;
                     const int middle = GetColLeft(colValid) +
                                             GetColWidth(colValid)/2;
-                    if ( GetLayoutDirection() == wxLayout_LeftToRight )
-                        onNearPart = (x <= middle);
-                    else // wxLayout_RightToLeft
-                        onNearPart = (x > middle);
+                    const bool onNearPart = (x <= middle);
 
                     // adjust for the column being dragged itself
                     if ( pos < GetColPos(m_dragRowOrCol) )