[konsole] [Bug 414987] New: while editing commandline with unicode symbols, text disappears or inadequate

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https://bugs.kde.org/show_bug.cgi?id=414987

            Bug ID: 414987
           Summary: while editing commandline with unicode symbols, text
                    disappears or inadequate
           Product: konsole
           Version: 19.08.0
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: mintytail at gmail.com
  Target Milestone: ---

SUMMARY
If I have unicode symbols in current line, which is longer, than window width,
either pasted or in shell prompt (regardless of the shell program, zsh, sh),
and if i try to delete symbols from the middle of the string, position of
cursor and string rendering is inadequate, making me unable to see the changes.

STEPS TO REPRODUCE
1. make Konsole window 80 charachters wide with running "sh" in it (i'm using
zsh so i just run sh and execute "reset")
2. paste that string (it is without newlines) into sh prompt: 
->  scada git:(development) ✗ ln -s "cloud interface.default.ini"
"../../../../../../cloud interface/cloud interface.default.ini"
3. observe no "newline"
4. move cursor back to the beginning of the line, press "delete" (maybe until
entered string become shorter, than window width)
5. observe cursor moving down for some reason and mess in editing string

Another way to reproduce
1. Using zsh with robbyrussell theme (https://ohmyz.sh) inside the git
repository (only to have some unicode symbols, like "✗" in the prompt)
2. Make window 80 charachters wide
3. paste long line, to be longer than window width
4. Using "←" key move to the previous line
5. Press "Home"
6. Observe cursor not in the beginning of line, but couple charachters to the
right (also, editing edits shifted string, not as on screen)

OBSERVED RESULT
impossible to edit long commands with unicode charachters on the same line

EXPECTED RESULT
unicode charachters should not affect behaviour of the edit

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: kded5 5.61.0
(available in About System)
KDE Plasma Version: plasmashell 5.16.4
KDE Frameworks Version: 
Qt Version: QMake version 3.1  Using Qt version 5.13.0 in /usr/lib

ADDITIONAL INFORMATION

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