[konsole] [Bug 425578] New: Variation selectors don't change column widths of preceding characters correctly

[Frederick Zhang]

https://bugs.kde.org/show_bug.cgi?id=425578

            Bug ID: 425578
           Summary: Variation selectors don't change column widths of
                    preceding characters correctly
           Product: konsole
           Version: 20.08.0
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: frederick888 at tsundere.moe
  Target Milestone: ---

Created attachment 131035
  --> https://bugs.kde.org/attachment.cgi?id=131035&action=edit
Up: Konsole, Below: Kitty

SUMMARY
Variation selectors (U+FE0E, U+FE0F) should be able to enforce column width on
some preceding characters, e.g. U+270F ✏. However they have no effects in
Konsole.

STEPS TO REPRODUCE
1. Launch Konsole
2. echo -e '\U270F XX\nABCD'
3. echo -e '\U270F\UFE0E XX\nABCD'
4. echo -e '\U270F\UFE0F XX\nABCD'

OBSERVED RESULT
U+270F always occupies one column.

EXPECTED RESULT
The third command should cause U+270F to occupy 2 columns.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.73.0
Qt Version: 5.15.0
Kernel Version: 5.8.1-zen1-1-zen
OS Type: 64-bit

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