Fix bug with automatic name switch on re-saved files
Excel files that are re-saved under a different name switch document name with the original file.
This happens regularly: I opened an Excel file with name "201905" and resaved it as "201906" with a slightly different content. After a while suddenly I had both files open on my desktop and the original file and my edited file had changed names. Thus the edited file was named 201905, however, this is supposed to be the original file. Creates potential significant issues when not aware of it.