DRAWING_SHEET_PARSER: fix missing parse of "T_comment" case for DS_DATA_ITEM_BITMAP.

Fixes #10477
https://gitlab.com/kicad/code/kicad/issues/10477
From Master.

common/drawing_sheet/drawing_sheet_parser.cpp

@@ -2,7 +2,7 @@
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
  * Copyright (C) 1992-2013 Jean-Pierre Charras <jp.charras at wanadoo.fr>.
- * Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 1992-2022 KiCad Developers, see AUTHORS.txt for contributors.
  *
  *
  * This program is free software; you can redistribute it and/or
@@ -494,6 +494,12 @@ void DRAWING_SHEET_PARSER::parseBitmap( DS_DATA_ITEM_BITMAP * aItem )
             NeedRIGHT();
             break;
 
+        case T_comment:
+            NeedSYMBOLorNUMBER();
+            aItem->m_Info = FromUTF8();
+            NeedRIGHT();
+            break;
+
         case T_pngdata:
             readPngdata( aItem );
             break;