[Libreoffice-bugs] [Bug 113543] New: When exporting to tagged PDF, characters in certain fonts are lost or misrepresented in the underlying text.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=113543

            Bug ID: 113543
           Summary: When exporting to tagged PDF, characters in certain
                    fonts are lost or misrepresented in the underlying
                    text.
           Product: LibreOffice
           Version: 5.4.2.2 release
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: quentin at nvaccess.org

I am using Google's Raleway font: https://fonts.google.com/specimen/Raleway

When I export to Tagged PDF, visually, the exported PDF appears normal.  If you
read with a screen reader, or copy the text from the PDF, characters may be
missing or misrepresented.  This problem seems to be worse when the document is
zoomed out further.

To reproduce:

1. Set the font to Raleway.
2. Type the word "certificate".
3. Set the zoom to 20% (either control+mouse scroll wheel down, or from the
view menu then zoom).
4. Export to PDF (alt+f, then e) and be sure to check "tagged PDF".
5. Open the exported PDF file in Adobe Reader.
6. Copy all the text.  Press CONTROL+A to select all, then CONTROL+C to copy.
7. Paste the text into notepad, LO writer, or anywhere else.

The expected result is that the pasted text should be the same as the original
text - the word "certificate" in this case.

The actual result is a word with incorrect characters.  Usually either a
missing i (certifcate), or substituted letters (certificcte) or both
(certifccte).

I tested on both Windows 7 and Windows 10 with LibreOffice 5.4.2.2 (x64).

On the Windows 7 machine, increasing zoom level didn't seem to be as likely to
fix the issue as it seemed to on Windows 10.

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