bash 4.3: "Clear Scrollback and Reset" (Ctrl-Shift-X) in konsole stopped to work as expected when upgrading from upstream bash 4.2 to upstream bash 4.3

[Askar Safin]

Package: bash
Version: 4.3
Severity: important
Tags: upstream

Steps to reproduce: open konsole (with bash in it) and type Ctrl-Shift-X (this 
is shortcut for "Clear Scrollback and Reset" feature in konsole). What I see: 
the terminal clears and no prompt appear. What I expected: I expected prompt to 
appear.

This is upstream bug, and it is a regression. It appeared in bash 4.3, but in 
bash 4.2 there was no such bug.

My system is Debian Wheezy 7 amd64. My konsole version is 4:4.8.4-2 (upstream 
version: 2.8.4).

And in fact, I don't know whatever this is bug in bash, in konsole, or this is 
not a bug at all. Also, this is upstream bug, so I CC'd bug-bash@gnu.org . And 
it is konsole-related, so I CC'd konsole-devel@kde.org .

Also, the bug reproduces on both bash 4.2 and 4.2 in gnome-terminal with its 
reset feature.

Also, I want to say that this is very confusing, hard-to-localize and 
hard-to-catch bug. At first, I noticed that Ctrl-Shift-X doesn't work as 
expected when I connect to some Ubuntu machine over ssh. At first I started to 
think this is ssh misconfiguration or some performance issue. Then I noticed 
that it reproduces with Ubuntu Trusty (with bash 4.3) remote machine and 
doesn't reproduce with Debian Wheezy (with bash 4.2) one. Then I understand 
that the bug is not related to ssh at all and this is just bash+konsole bug. 
So, because of this very confusing nature of the bug, I gave it priority 
"important".
==
Askar Safin
http://vk.com/safinaskar
Kazan, Russia