Kicad: fix project tree icon list after changes in commit a9877ab1.

The icon list and the file types list must be synchronized.

kicad/project_tree.cpp

@@ -2,7 +2,7 @@
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
  * Copyright (C) 2004-2012 Jean-Pierre Charras
- * Copyright (C) 2004-2020 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 2004-2022 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -88,6 +88,7 @@ void PROJECT_TREE::LoadIcons()
     m_imageList->Add( KiBitmap( BITMAPS::file_html ) );              // TREE_HTML
     m_imageList->Add( KiBitmap( BITMAPS::file_pdf ) );               // TREE_PDF
     m_imageList->Add( KiBitmap( BITMAPS::editor ) );                 // TREE_TXT
+    m_imageList->Add( KiBitmap( BITMAPS::editor ) );                 // TREE_MD
     m_imageList->Add( KiBitmap( BITMAPS::netlist ) );                // TREE_NET
     m_imageList->Add( KiBitmap( BITMAPS::unknown ) );                // TREE_UNKNOWN
     m_imageList->Add( KiBitmap( BITMAPS::directory ) );              // TREE_DIRECTORY

kicad/tree_file_type.h

@@ -1,7 +1,7 @@
 /*
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
- * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 2022 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -28,8 +28,9 @@
 // Identify the type of files handled by KiCad manager
 //
 // When changing this enum  please verify (and perhaps update)
-// PROJECT_TREE_PANE::GetFileExt(),
-// s_AllowedExtensionsToList[]
+// PROJECT_TREE_PANE::GetFileExt(), s_AllowedExtensionsToList[]
+// and the list of images in PROJECT_TREE::LoadIcons(). This icons must me in the same
+// order as TREE_FILE_TYPE
 enum class TREE_FILE_TYPE
 {
     ROOT = 0,