Terminal occasionally shows duplicate command text when it is split over multiple lines

[Thomas Wolff]

Am 23.08.2021 um 23:52 schrieb Ray Satiro via Cygwin:
> I'm using cygwin x86 updated yesterday and when I paste in commands that are split over multiple lines sometimes an arbitrary line will show more than once, even though it is not actually part of the command more than once. For example here's a command:
>
> echo foo \bar \baz \qux
>
> And here's the terminal output when I paste it in:
>
> $ echo foo \qux
>> bar \> baz \> quxfoo bar baz qux
> $ echo foo \baz \> bar \> baz \> quxfoo bar baz qux
Please provide a clear test case. How exactly would your clipboard have 
multiple lines? Your example is only one line.

> My terminal is mintty 3.5.0 (i686-pc-cygwin). I'm not sure if this is a cygwin issue or mintty issue.