Arch Linux

Description:
I regularly use konsole (or rather, yakuake, but both share the exactly same behaviour), and tmux.

Today's update to konsole-19.12.0-1 introduced a bug: I still can start tmux copy mode (C-b [), select text (space + navigation keys); but when I want to save this text in tmux's clipboard, the konsole tab freezes. It can be closed by the usual means (× symbol or C-R, the “really close?” dialog appears as it should), you can switch tabs/start new tabs, but the terminal itself is totally unresponsive.

I can connect to the same tmux session from another terminal (xterm) and there everything works as it did before. Even the act of copying worked, you can just paste it.
Contrary, the bug occurs with tmux sessions from other hosts (SSH, tried with Gentoo, Debian Stretch, FreeBSD 12.1).

Oddly enough, this does only happen for copying plain terminal output, and not if the selected text is inside a Vim editor window.


Quick fix was downgrading & pinning konsole at version 19.08.3-1.
Downgrading tmux-2.9_a-4 (4 months old) did not help, so this new behaviour was introduced with the konsole update.


Additional info:
* package versions: konsole-19.12.0-1 tmux-3.0_a-1 (but 2.9 series and other OSes are affected, too)

Steps to reproduce:
* Open a konsole (or yakuake) window/tab
* Open/connect to a tmux session (not necessarily local), regular terminal (not Vim)
* Start copy mode (default key: C-b [)
* Select some text
* Save the text into clipboard (default: Enter)