clear screen and /or scrollbar not working

hi, there.

we have tried with ctrl+l, ctrl+shift+l, nothing clear, but one/or two new line is added to the last screen.
how can we clean the whole screen, we checked with menu, key boards shutcut , nothings.

regards, zan

No source file, test, or entry point is identified in the report. Reproduce the Ctrl+L and Ctrl+Shift+L behavior in a terminal session, checking both screen clearing and scrollbar state; done means the whole screen clears and the scrollbar behaves as expected.

Written by the indexing model from the issue text.