Safer way to do std::string conversions.

eeschema/dialogs/dialog_fields_editor_global.cpp

@@ -769,7 +769,7 @@ DIALOG_FIELDS_EDITOR_GLOBAL::DIALOG_FIELDS_EDITOR_GLOBAL( SCH_EDIT_FRAME* parent
         if( m_grid->IsColShown( col ) )
         {
             EESCHEMA_SETTINGS* cfg = static_cast<EESCHEMA_SETTINGS*>( Kiface().KifaceSettings() );
-            std::string        key = m_dataModel->GetColLabelValue( col ).ToStdString();
+            std::string        key = m_dataModel->GetColLabelValue( col ).ToUTF8();
 
             if( cfg->m_FieldEditorPanel.column_widths.count( key ) )
             {
@@ -1099,10 +1099,10 @@ void DIALOG_FIELDS_EDITOR_GLOBAL::OnTableColSize( wxGridSizeEvent& aEvent )
 {
     EESCHEMA_SETTINGS* cfg = static_cast<EESCHEMA_SETTINGS*>( Kiface().KifaceSettings() );
     int                col = aEvent.GetRowOrCol();
-    std::string        key = m_grid->GetColLabelValue( col ).ToStdString();
+    std::string        key = m_grid->GetColLabelValue( col ).ToUTF8();
 
     if( m_grid->GetColSize( col ) )
-        cfg->m_FieldEditorPanel.column_widths[ key.ToStdString() ] = m_grid->GetColSize( col );
+        cfg->m_FieldEditorPanel.column_widths[ key ] = m_grid->GetColSize( col );
 
     aEvent.Skip();
 }