Richedit сам меняет язык при перемещении

unit RichEditEx;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ComCtrls;

type
  TLangChangeEvent = procedure(Sender: TObject; Lang: HKL) of object;

  TRichEditEx = class(TRichEdit)
  private
    FOnLangChange: TLangChangeEvent;
    procedure WMLangRequest(var M: TMessage); message WM_INPUTLANGCHANGEREQUEST;
    procedure WMLangChange(var M: TMessage); message WM_INPUTLANGCHANGE;

    { Private declarations }
  protected
    { Protected declarations }
  public
    { Public declarations }
  published
    property OnLangChange: TLangChangeEvent read FOnLangChange write
      FOnLangChange;

    { Published declarations }
  end;

procedure Register;

implementation

procedure tricheditex.WMLangRequest(var M: TMessage);
begin
  if assigned(FOnLangChange) then
    FOnLangChange(self, m.LParam);
  inherited;
end;

procedure tricheditex.WMLangChange(var M: TMessage);
begin
  m.Result := 1;
end;

procedure Register;
begin
  RegisterComponents('Samples', [TRichEditEx]);
end;

end.