Konsole scrolling weirdness

Some users are experiencing weird visual glitches when scrolling in Konsole. The problem isn't trivial to debug but until it gets fixed there are a couple of workarounds:

• Un-hide the menu bar if it is hidden
• Set the QT_USE_NATIVE_WINDOWS environment variable to '1' before starting Konsole (export QT_USE_NATIVE_WINDOWS=1)