[konsole] [Bug 415249] New: Tab goes unresponsive if copying in tmux copy mode

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https://bugs.kde.org/show_bug.cgi?id=415249

            Bug ID: 415249
           Summary: Tab goes unresponsive if copying in tmux copy mode
           Product: konsole
           Version: 19.12.0
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: emulation
          Assignee: konsole-devel at kde.org
          Reporter: kjift14 at posteo.at
  Target Milestone: ---

I regularly use konsole (or rather, yakuake, but both share the exactly same
behaviour), and tmux on an Archlinux desktop.

A recent package 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. No CLI messages are created.

I can connect to the same tmux session from other terminals (I tried xterm) and
there everything works as it did before. Even the copy did take place, you can
paste the previously selected text (C-b ]).
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.




STEPS TO REPRODUCE
1. Open a konsole (or yakuake) window/tab
2. Open/connect to a tmux session (not necessarily local), regular terminal
(not Vim)
3. Start copy mode (default key: C-b [)
4. Select some text
5. Save the text into clipboard (default: Enter)


OBSERVED RESULT
The tab in question becomes unresponsive and has to be closed forcibly.


EXPECTED RESULT
The tab to continue working (like it does in older Konsole versions and other
terminal emulators).


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.4.3-arch1-1, no Plasma desktop (Fluxbox WM + Konsole as a
standalone terminal emulator/Yakuake + Konsole KPart)
KDE Plasma Version: n/a
KDE Frameworks Version: n/a
Qt Version: 5.13.2-1 (Archlinux packages)

ADDITIONAL INFORMATION
Originally posted in the Archlinux tracker at
https://bugs.archlinux.org/task/64848

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