PANEL_SYM_LIB_TABLE: fix a bug in filenames from wxFileDialog dialog.

We want the full path, so use GetPaths.
GetFilenames sometimes return the full path in wxWidgets 3.1.7, not always the filename
Fixes #11821
https://gitlab.com/kicad/code/kicad/issues/11821

eeschema/dialogs/panel_sym_lib_table.cpp

@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2017 Wayne Stambaugh <stambaughw@gmail.com>
  * Copyright (C) 2021 CERN
- * Copyright (C) 2017-2021 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 2017-2022 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 as published by the
@@ -505,12 +505,11 @@ void PANEL_SYM_LIB_TABLE::browseLibrariesHandler( wxCommandEvent& event )
     wxString           detailedMsg   = _( "One of the nicknames will need to be changed after "
                                           "adding this library." );
 
-    wxArrayString files;
-    dlg.GetFilenames( files );
+    wxArrayString filePathsList;
+    dlg.GetPaths( filePathsList );
 
-    for( const wxString& file : files )
+    for( const wxString& filePath : filePathsList )
     {
-        wxString   filePath = dlg.GetDirectory() + wxFileName::GetPathSeparator() + file;
         wxFileName fn( filePath );
         wxString   nickname = LIB_ID::FixIllegalChars( fn.GetName(), true );
         bool       doAdd = true;
@@ -556,7 +555,7 @@ void PANEL_SYM_LIB_TABLE::browseLibrariesHandler( wxCommandEvent& event )
         }
     }
 
-    if( !files.IsEmpty() )
+    if( !filePathsList.IsEmpty() )
     {
         m_cur_grid->MakeCellVisible( m_cur_grid->GetNumberRows() - 1, 0 );
         m_cur_grid->SetGridCursor( m_cur_grid->GetNumberRows() - 1, 1 );