[konsole] [Bug 384218] New: clear/^l shouldn't add empty lines to the scrollback buffer

[RJVB]

https://bugs.kde.org/show_bug.cgi?id=384218

            Bug ID: 384218
           Summary: clear/^l shouldn't add empty lines to the scrollback
                    buffer
           Product: konsole
           Version: unspecified
          Platform: Compiled Sources
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: history
          Assignee: konsole-devel at kde.org
          Reporter: rjvbertin at gmail.com
  Target Milestone: ---

Executing the `clear` command clears the current view and leaves the
prompt/cursor at the top of the window, but also adds the remaining number of
empty lines to the scrollback buffer. IOW, if you execute it when the cursor is
already at the top of a view that's N lines high, you get N empty lines in the
scrollback buffer.

That's counterproductive.

The clear manpage states that the command `clears  your screen if this is
possible, including its scrollback buffer (if the extended "E3" capability is
defined).  clear looks in the environment for the terminal type and then in the
terminfo database to determine how to clear the screen`.

I'm not certain we'd want the scrollback clearing but there must be a way to
avoid the empty lines to it.

FWIW, I use TERM=xterm, and I note that xterms (v297) behave as I'd expect
(`clear` doesn't affect the scrollback buffer contents at all).

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