Add wxBitmap::GetLogical{Width,Height,Size}()

These functions have better names than the existing GetScaledXXX() ones,
so add them to be able to use them in the new code, even if we still
keep the old ones for compatibility.

include/wx/bitmap.h

@@ -198,10 +198,16 @@ public:
 
     // These functions return the corresponding metrics divided by the scale
     // factor on platforms with DPI-independent pixels (e.g. GTK, Mac) and just
-    // the same thing as the non-scaled accessors elsewhere (e.g. MSW).
-    double GetScaledWidth() const;
-    double GetScaledHeight() const;
-    wxSize GetScaledSize() const;
+    // return the same thing as normal accessors elsewhere (e.g. MSW).
+    double GetLogicalWidth() const;
+    double GetLogicalHeight() const;
+    wxSize GetLogicalSize() const;
+
+    // Old synonyms for GetLogicalXXX() functions, prefer the new names in the
+    // new code.
+    double GetScaledWidth() const { return GetLogicalWidth(); }
+    double GetScaledHeight() const { return GetLogicalHeight(); }
+    wxSize GetScaledSize() const { return GetLogicalSize(); }
 
 #if wxUSE_IMAGE
     virtual wxImage ConvertToImage() const = 0;