[bug #67994] GUI command window overrides content after using `system`

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Update of bug #67994 (group octave):

                  Status:          Ready For Test => Confirmed

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Follow-up Comment #3:

I didn't think of output to stderr also having that effect. (bug #68006 was a
reminder for that.)

The following command still messes with the synchronization of the output with
the console that is used for the command window widget on Windows:

[a, b] = system ("gcc -version")


Same steps to reproduce as in comment #0. But replace `system ('echo 1')` with
the command from above.

Maybe, we'll need the patch that creates a new console for `pipe` after all.

Resetting status to "confirmed".



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