[Poppler-bugs] [Bug 46603] some glyphs not displayed when text is selected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46603

--- Comment #18 from Adrian Johnson <ajohnson at redneon.com> 2012-03-18 15:18:23 PDT ---
Created attachment 58643
  --> https://bugs.freedesktop.org/attachment.cgi?id=58643
fix regressions

This patch fixes the regressions in "Enable displayed chars to map to any
number of text chars".

The problem is the changes now allow glyphs that map to zero length unicode
strings to be added to TextWords. Often these glyphs have overlapping bounding
boxes or are not on the same baseline. This confuses TextOutputDev when trying
to determine the layout of the text.

This patch does two things:
- it avoids breaking words when one of these glyphs with an empty mapping is
encountered
- it increases the tolerance for overlapping bounding boxes.

With the attached PDF the result the text output is still different but
checking the differences it is actually an improvement.

However I suspect the changes could potentially break other PDFs. If this patch
causes problems, plan B is to change TextOutputDev to ignore the glyphs with
zero mapping when determining the text layout (but still add these glyphs to
the words to make text selection work correctly). This should emulate the old
behavior as closely as possible.

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