Bug#962923: konsole: ctrl+l behaviour changed, now deletes the text

[Ismael <sulfurfff@gmail.com>]

Package: konsole
Version: 4:19.08.1-2+b1
Severity: normal

Dear Maintainer,

After an update around March, every time I press ctrl+l to clear the
scrollback buffer, instead of moving the text upwards out of sight,
but keeping it there for further consulting, it just clears everything
in the screen, but still leaves older output text that's outside the
current view.

I verified it does the same when executing directly "clear -x"

I verified it's a konsole problem, as xfce4-terminal and gnome-terminal
stil maintain the previous behaviour.

Just this weekend I did a fresh install of Debian/testing and verified
that the problem is not about my configuration, used standar US/english
and UTF-8 encoding for the installation.

Pressing ctrl+l should just "move" everything on the screen upwards
but keep it there, it the scrollback buffer.



-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.6.0-2-amd64 (SMP w/12 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages konsole depends on:
ii  kio                    5.70.1-1
ii  konsole-kpart          4:19.08.1-2+b1
ii  libc6                  2.30-8
ii  libkf5configcore5      5.70.0-1
ii  libkf5configwidgets5   5.70.0-1
ii  libkf5coreaddons5      5.70.0-1
ii  libkf5crash5           5.70.0-1
ii  libkf5dbusaddons5      5.70.0-1
ii  libkf5globalaccel-bin  5.70.0-1
ii  libkf5globalaccel5     5.70.0-1
ii  libkf5i18n5            5.70.0-1
ii  libkf5iconthemes5      5.70.0-1
ii  libkf5kiowidgets5      5.70.1-1
ii  libkf5notifyconfig5    5.70.0-1
ii  libkf5widgetsaddons5   5.70.0-1
ii  libkf5windowsystem5    5.70.0-1
ii  libkf5xmlgui5          5.70.0-1
ii  libqt5core5a           5.12.5+dfsg-10+b1
ii  libqt5gui5             5.12.5+dfsg-10+b1
ii  libqt5widgets5         5.12.5+dfsg-10+b1
ii  libstdc++6             10.1.0-3

konsole recommends no packages.

Versions of packages konsole suggests:
pn  lrzsz  <none>

-- no debconf information