[Qt] Assertion failure in Search dialog

[Juha Manninen]

in speedbutton.inc, line 477, there is:

---
function TCustomSpeedButton.DialogChar(var Message: TLMKey): boolean;
begin
  Result := False;

  Assert(Message.Msg = LM_SYSCHAR, '*** Warning: non LM_SYSCHAR passed to 
TCustomSpeedButton.DialogChar ! ***');

  if not FShowAccelChar then Exit;

  if IsAccel(Message.CharCode, Caption) then
  begin
    Result := True;
    if GroupIndex <> 0 then
      SetDown(not FDown);
    Click;
  end else
    Result := inherited DialogChar(Message);
end;
---

My Lazarus is built with QT bindings. The assertion fails when I open the 
Search dialog (Ctrl-F) and then press for example Enter or Ctrl-C.
Message.Msg is LM_CHAR (258) instead of LM_SYSCHAR (262).
With GTK2 bindings it works ok.

Does this indicate a real error or is the assertion wrong?
Somebody please fix or remove it.

Juha