Fix drawing of items with custom background in wxGenericListCtrl.

This was broken by the changes of r64879 which erroneously used
wxRendererNative::DrawItemSelectionRect() even for the non-selected items.

Now only use DrawItemSelectionRect() for the selected items to make them
appear natively while drawing the non-selected items with custom background
colour ourselves.

Also refactor the code to avoid (the not quite and hence especially
pernicious) duplication between wxListLineData::Draw() and DrawInReportMode():
rename SetAttributes() to ApplyAttributes() and draw the item background in
this function now instead of doing it in both Draw() and DrawInReportMode().

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65541 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/private/listctrl.h

@@ -275,9 +275,10 @@ public:
     }
 
     // draw the line on the given DC in icon/list mode
-    void Draw( wxDC *dc );
+    void Draw( wxDC *dc, bool current );
 
-    // the same in report mode
+    // the same in report mode: it needs more parameters as we don't store
+    // everything in the item in report mode
     void DrawInReportMode( wxDC *dc,
                            const wxRect& rect,
                            const wxRect& rectHL,
@@ -291,11 +292,12 @@ private:
     // get the mode (i.e. style)  of the list control
     inline int GetMode() const;
 
-    // prepare the DC for drawing with these item's attributes, return true if
-    // we need to draw the items background to highlight it, false otherwise
-    bool SetAttributes(wxDC *dc,
-                       const wxListItemAttr *attr,
-                       bool highlight);
+    // Apply this item attributes to the given DC: set the text font and colour
+    // and also erase the background appropriately.
+    void ApplyAttributes(wxDC *dc,
+                         const wxRect& rectHL,
+                         bool highlighted,
+                         bool current);
 
     // draw the text on the DC with the correct justification; also add an
     // ellipsis if the text is too large to fit in the current width