[konsole] [Bug 462940] New: Font ligature not working

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=462940

            Bug ID: 462940
           Summary: Font ligature not working
    Classification: Applications
           Product: konsole
           Version: 22.12.0
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: liu.xd1998 at outlook.com
  Target Milestone: ---

Created attachment 154522
  --> https://bugs.kde.org/attachment.cgi?id=154522&action=edit
test result with "===" and "<=>"

SUMMARY
The font ligature is not rendered in terminal text. However, in the font
setting window it can be displayed correctly.
The font testing is 'Caskaydia Cove Nerd Font', a variant of 'Cascadia Code'. 
(Available at here:
https://github.com/ryanoasis/nerd-fonts/releases/download/v2.2.2/CascadiaCode.zip
)


STEPS TO REPRODUCE
1. Open Konsole
2. Type some symbols in the command line which should display with ligature
(e.g. "===" or "<=>")
3. Type the same symbols at the preview textbox in font-setting dialogue.

OBSERVED RESULT
The ligature does not work in Konsole command line, but works in preview.

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Arch Linux(x86_64)
(available in About System)
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7

ADDITIONAL INFORMATION

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