In-reply-to » Bloody hell, my system update affected the libc, libc6, locales and golang-1.19 packages and after a reboot KMail is fucked. Uses 100% CPU and doesn't show any mail texts anymore. Starting it in a terminal then shows heaps of org.kde.pim.webengineviewer: WebEngine render process crashed being printed to stdout.

Looking at the Qt WebEngine docs on debugging helped: QTWEBENGINE_CHROMIUM_FLAGS="--single-process" kmail surpringly works… O_o WTF. This goes in the /usr/local/bin/kmail wrapper script then.

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