[Poppler-bugs] [Bug 66568] New: Text selection is broken in RTL scripts

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66568

          Priority: medium
            Bug ID: 66568
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: Text selection is broken in RTL scripts
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: gpoo at gnome.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: glib frontend
           Product: poppler

Created attachment 82000
  --> https://bugs.freedesktop.org/attachment.cgi?id=82000&action=edit
PDF Test case

I am reporting to poppler-glib, though it might be a general issue on how PDF
with RTL scripts are handled in poppler.  As per reported in GNOME Bugzilla:

"When I try to select text written in an RTL script (Hebrew, in my case) the
selection algorithm treats it like LTR text. This means that if I start a
selection in the midlle of a line in an RTL paragraph and move the cursor to
the middle of the next line, the selection spans to the right on the first line
and from the left up to the cursor in the next line. This is okay for LTR, but
in RTL scripts it should work exactly the opposite. The expected behaviour is
just like the GtkTextView widget's."


I tested it also with poppler-glib-demo. It is reproducible when selecting
multiples lines.  One of the comments has a clue of the problem:
https://bugzilla.gnome.org/show_bug.cgi?id=326083#c5

"PDF stores Hebrew internally as visual Hebrew (LTR), so Envice will have to
detect Hebrew text and work around this.
It seems like Envice Evince 0.5.2 Using poppler 0.5.1 (splash) correctly
reverses Hebrew when pasting to gedit, but does not do the selection properly
(like Yaron noted)."

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