[konsole] [Bug 380451] New: Font fallback/rendering issue when CJK text appears in some KDE applications

[LiTuX]

https://bugs.kde.org/show_bug.cgi?id=380451

            Bug ID: 380451
           Summary: Font fallback/rendering issue when CJK text appears in
                    some KDE applications
           Product: konsole
           Version: unspecified
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: LiTuX at live.com
  Target Milestone: ---

Created attachment 105840
  --> https://bugs.kde.org/attachment.cgi?id=105840&action=edit
Text rendering in Konsole, Kate and KMail

In konsole, when text include east Asian characters, but the font do not
include glyph of those characters (e.g., the default font), text were cropped
so part of a character is invisible.

This issue exist in konsole, kate/kwrite, konquerer (when opening a text file),
but not in kmail.

To reproduce: run `echo Hello 世界` in konsole, or copy the output to kate.

The issue exist in lots of distros with KDE desktop I've tested, e.g., Kubuntu
16.04 LTS, 17.04, neon and neon LTS, debian 8.7 (with KDE 4), Archlinux, and et
al..

See attached screenshots for details.

More screenshots can be found here:
https://bugs.launchpad.net/ubuntu/+source/konsole/+bug/1667187

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