Since then, I have opened a fix attempt upstream [1].
That could be a better candidate for patch to back-port.

[1]: https://invent.kde.org/utilities/konsole/-/merge_requests/1199

On Wed, 08 Apr 2026 17:03:11 +0200 Paul Mabileau <[email protected]> 
wrote:
> Package: konsole
> Version: 4:25.04.2-1
> Severity: normal
> Tags: patch upstream
> X-Debbugs-Cc: [email protected]
>
> Dear Maintainer,
>
> This is basically a repeat of the [upstream bug report] that very
> directly concerns me as well. Indeed, when upgrading to 4:25.04.2-1 last
> year while having the "word mode" enabled in the settings to get
> ligature rendering to work, the exact same symptoms could be observed:
> the width and spacing of characters would get very broken, with
> differences if they were before or after the cursor, making it quite
> unusable. Some videos are included in the [upstream bug report] that
> show the issue well. I am therefore filing this against 4:25.04.2-1 even
> though this was partially generated by `reportbug` for 4:24.12.0-1+b1.
>
> A simple workaround is to disable the option, hence the "normal"
> severity of the current bug report. However, doing so also disables
> ligatures and I would really like to keep them.
>
> I have then downgraded and held the `konsole` and `konsole-kpart`
> packages back to the latest version that does not have the issue
> (4:24.12.0-1+b1) until an upstream fix is published in the hope it would
> be relatively soon considering the nature of the bug. However, we are a
> year later and it still does not seem on the path to being resolved. To
> be fair though, I haven't tried the latest releases because rolling back
> is tedious, so it could already be fixed, but if so I would have
> expected that to be reported in the [upstream bug report].
>
> That worked fine for quite a while, but the new problem I find myself in
> is that holding these two packages back now starts to indirectly hold
> about 210 other KDE and Qt packages back also since their latest
> updates. While that does not seem to break anything for now, it is a bit
> bothersome, but more importantly I fear that it will get to be more and
> more of a problem as time goes on, and so I would like to do something
> about it if possible.
>
> The latest messages in the [upstream bug report] indicate that some
> people seem to already have identified a specific commit at fault and
> that reverting it fixes the issue. The point of the current bug report
> is thus: would it therefore be possible to attempt including the
> upstream-reported patch in the Debian builds? It would enable me to
> resume upgrading my KDE/Qt packages again, which would be nice.
>
> If needed, I can definitely run some temporary builds in order to
> confirm that the patch still works when applied on the latest releases
> and when running it using my configuration. I could also try building
> them myself, but I'm not sure that will be easy.
>
> Thank you in advance,
> Paul.
>
> [upstream bug report]: https://bugs.kde.org/show_bug.cgi?id=503087
>
>
> -- System Information:
> Debian Release: forky/sid
> APT prefers testing

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