Mixed Western and Asian characters in TRichEdit

Question

(Delphi XE4 / Win 7)

The TRichEdit component behaves strangely when both Western and Asian characters are to be displayed. Demo program (form, listbox, richedit with default setting from Object Inspector; Asian chars copied from a japanese website):

unit Unit1;

interface

uses
  System.Classes, Vcl.Forms, Vcl.StdCtrls, Vcl.ComCtrls, Vcl.Controls;

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    ListBox1: TListBox;
    procedure FormCreate(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

const
  arText: array[0..4] of string
        = ('00  AbC DEfgH  查找的资  AbC DEfgH  查找的资',
           '01  前大  ABCabc  為島  ABCabc  或繩  ABCabc',
           '02                  AbC DEfgH  繩最  ABCabc',
           '03  ABCabc  全面積  ABCabc  全面積  ABCabc',
           '04  方公里  AbC DEfgH  方公里');

procedure TForm1.FormCreate(Sender: TObject);
var
  i: Integer;
begin
  for i:=0 to 4 do
  begin
    ListBox1.Items.Add(arText[i]);
    RichEdit1.Lines.Add(arText[i]);
  end;
end;

end.

Demo running:

In the listbox all Western characters have the correct and same size. In the richedit, however, Western chars are only displayed correctly if there are no Asian chars in front of them. Otherwise, all following western chars are displayed with a reduced size.

Note: If you edit the text while the program is running, inserted Western characters will be displayed with the correct size - regardless of the position where they are inserted (inserted characters marked red):

Is there a way to correctly display the text from Western and Asian letters in a richedit? What needs to be done to make it work? Thanks in advance for any help!