[okular] [Bug 508449] New: Character isn’t positioned correctly at normal zoom levels

[Jendrik Stelzner]

https://bugs.kde.org/show_bug.cgi?id=508449

            Bug ID: 508449
           Summary: Character isn’t positioned correctly at normal zoom
                    levels
    Classification: Applications
           Product: okular
      Version First 25.08.0
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: jendrikstelzner+kdebugs at outlook.com
  Target Milestone: ---

Created attachment 184233
  --> https://bugs.kde.org/attachment.cgi?id=184233&action=edit
A test file that exhibits the described problem.

The attached PDF file contains the example text `H∑y` set in JuliaMono. The
middle character is the summation sign (U+02211). In JuliaMono the summation
sign goes up slightly higher than `H` and goes down as low as `y`. But Okular
displays it shifted upwards, so that it sits on the baseline instead. This
problem disappears with a zoom of at least 1,839%.

STEPS TO REPRODUCE
1. Open the attached PDF file.
2. Zoom to 1,838%.
3. Zoom to 1,839%.

OBSERVED RESULT
When the file is first opened the summation sign sits on the base line. Zooming
to 1,838% doesn’t change that. Zooming in one percent further to 1,839% makes
the summation sign suddenly drop down as low as `y`; it is now only slightly
higher than `H`.

EXPECTED RESULT
The summation sign should be positioned correctly even at normal zoom levels.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux (fully updated)
KDE Plasma Version:  6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1

ADDITIONAL INFORMATION
- The file was created with LuaLaTeX.
- The problem does not seem to occur with other PDF viewers or with programs
that can import PDF files. I’ve tested Evince, Xpdf and Firefox, and I imported
it in Inkscape, Krita and Gimp.
- I have only experienced the problem with this specific character (the
summation sign) in this specific font (JuliaMono).

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