[okular] [Bug 504083] New: 1st level heading won't be correctly rendered if the Markdown document uses UTF-8 BOM(byte-order mark)

[林博仁]

https://bugs.kde.org/show_bug.cgi?id=504083

            Bug ID: 504083
           Summary: 1st level heading won't be correctly rendered if the
                    Markdown document uses UTF-8 BOM(byte-order mark)
    Classification: Applications
           Product: okular
           Version: 25.04.1
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: markdown backend
          Assignee: okular-devel at kde.org
          Reporter: Buo.Ren.Lin at gmail.com
  Target Milestone: ---

Created attachment 181190
  --> https://bugs.kde.org/attachment.cgi?id=181190&action=edit
Bug reproduction screenshot

SUMMARY

If the following requirements are met for a Markdown document:

* The file is saved with (UTF-8) BOM
* The 1st-level heading is at the beginning of the file

The 1st-level heading will be wrongly rendered as regular text.

STEPS TO REPRODUCE
1. Launch Kate.
2. In Kate, create a new Markdown document.
3. In the new document, write `# title` at the beginning of the file.
4. Toggle the Tools > Add Byte Order Mark (BOM) menu option.
5. Save the file.
6. Open the saved file using Okular and verify its rendered result.

OBSERVED RESULT

The 1st-level heading is wrongly rendered as regular text.

EXPECTED RESULT

The 1st-level heading is correctly rendered as 1st-level heading.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 24.04
KDE Plasma Version: 5.27.12
KDE Frameworks Version(Flatpak): 6.13.0
Qt Version(Flatpak): 6.9.0

ADDITIONAL INFORMATION

Reproduced on the Flatpak distribution of Okular, version 25.04.1.

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