Links for files in subfolders fail

[prichterich]

Up to htmldoc version 1.9.3, htmldoc handled links to files in subfolders correctly. Later versions, including 1.9.18, create non-functional links in the PDF file. For example, this link:
<a href="edit/edit_undo.htm">Undo</a>
in the PFD file does not work, and hovering shows a file link instead of the usual "Go to page #":
file://Users/Shared/.../edit/edit_undo.htm
The corresponding object entry in the PDF file is:
obj<</S/Launch/F(edit/edit_undo.htm)>>endobj

A ZIP archive with an example that works in 1.9.3 but fails in 1.9.18 is attached.
htmldoc_link_bug2.zip

[michaelrsweet]

Will investigate for 1.9.19...