autofill current filename for file to export to PDF

[christopherthomson]

I have a completed document saved as 'assignment1.md'. I go to File > Export > PDF, and the 'Export document to PDF' opens. The 'File name' field is blank. It would be great to have this auto fill with the name of the .md file as I like to use the same file name for the exported document, just with the .pdf extension.

Some people might consider this a feature, I suppose, but is it that useful to name two 'synced' versions of the same document differently? At present I re-type the file-name upon export, checking to ensure I've matched it correctly.

I'm using Ubuntu 16.04. Thanks!