https://bugs.kde.org/show_bug.cgi?id=471443

--- Comment #10 from Ilya Fedin <fedin-ilja2...@ya.ru> ---
Try any distro build of Telegram Desktop (official builds patch Qt to work
around the bug) on a KDE X11 session with fractional scaling factor (e.g.
1.25). The app is full of 10 year old code, written before Qt got HiDPI
support, it has integer devicePixelRatio support thanks to macOS but no
fractional devicePixelRatio support. Application uses
QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::RoundPreferFloor)
to tell Qt about that but given that KDE uses this user-override environment
variable (instead of the proper way) to tell the scale factor, this setting
gets ignored by Qt and application UI is broken.

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