Improve display of file encodings in TSaveSourceDlg

The "File encoding" label and combo box in TSaveSourceDlg is now
disabled when it only contains one item.

Author: delphidabbler

Src/USaveSourceDlg.pas

@@ -495,6 +495,8 @@ procedure TSaveSourceDlg.DoTypeChange;
   fCmbEncoding.ItemIndex := IndexOfEncodingType(fSelectedEncoding);
   if fCmbEncoding.ItemIndex = -1 then
     fCmbEncoding.ItemIndex := 0;
+  fCmbEncoding.Enabled := fCmbEncoding.Items.Count > 1;
+  fLblEncoding.Enabled := fCmbEncoding.Enabled;
   DoEncodingChange;
 
   inherited;