Artefacts appearing intermittently
Sometimes artefacts appear for a fraction of a second over the iTerm2 window.
They look like lines of different colour and hold approximately 10% of the height of a terminal, also they appear around the center of the terminal, a bit closer to the top of the central area.
They tend to appear when I hit some key which causes text in the terminal to change, but not every time I hit a key, only sometimes, and only for a fraction of a second.
I didn't do debug log, since it's an intermittent issue, which is not that straightforward to reproduce.
I have a suspicion that this is a Mac's hardware issue, maybe the lines appear over the whole desktop, not only over iTerm2 window.
com.googlecode.iterm2.plist
iTerm2 version: 2.1.4
OS version: 10.10.5 (14F27)