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Telegram silently closes if file picker is used under KDE 6

telegram-desktop 4.16.5-1 on KDE 6, everything is the latest and the greatest.

Once any file is attempted to be attached to any chat, or if the file is being downloaded, or if I don't even upload anything (just press the paper clip icon and then press "Cancel" in file picker window), Telegram silently closes. No SIGSEGV anywhere, no traces, no nothing.

Static TG build from official GitHub works just fine. But I noticed it used a different file picker window.

It started recently, but I don't know exactly when. I tried 4.16.1-1 today, and it was affected too.

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