Comment 6 for bug 1726262

I would like to mention that if you enable the option "Use transparency from system theme" then the flickering is even easier to reproduce just by typing SPACE in gnome-terminal --- you will that the cursor leaves a shadow/ghost behind itself which disappears after a couple of seconds. Also, executing "ls -l" (in a non-empty directory :) you will see that as the output scrolls up it leaves a shadow ghost which disappears only after a few seconds.

This was so EXTREMELY annoying (imagine editing source code in vim and going mad because of these shadow blocks of code :) that I even thought of reverting back to 16.04, but fortunately I found this bug report which provided the workaround to disable "Use transparency from system theme" which works fine. Thank you!

Oh and yes, this only happens on the second/external monitor connected via VGA.

Btw, there is another annoying bug here --- when the mouse is on some areas of the main monitor another duplicate mouse pointer is visible and moving around on the second monitor. My second monitor is in portrait, so this "extra" mouse pointer is moving in the perpendicular dimension which is distracting.... But I guess this belongs to a separate bug report.