pdftohtml: fakebold and dropshadow duplicated text

Submitted by Jason Crain

Assigned to poppler-bugs

Description

If you run pdftohtml on the PDF in bug #101770 (https://bugs.freedesktop.org/attachment.cgi?id=132659) It results in duplicated and jumbled characters.

Some PDFs draw text multiple times to emulate bold text or drop shadows. The main TextOutputDev goes to a lot of trouble to remove this duplicated text. pdftohtml should do this too.

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