Hi again,
in the meantime I found the solution to my query.
User /Jasen /from *unix.stackexchange *kindly helped me
(https://unix.stackexchange.com/questions/446883/fish-shell-shortcut-ctrl-l).
For anyone interested here´s the answer:
"unix terminals are filled with content by interpreting control
sequences and text intermixed in a single stream. many characters can be
both text and a control code and it depends on context what they mean.
<esc>[3;J is one such sequence. in the wrong context it prints, in the
right context it's part of resetting the display.
see the termcap, console_codes, and tput man pages for more details."
Greetings
Rosika
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