Thanks a lot for your investigation. I am routinely editing 40 - 50 files at the same time (that makes 3 lines of file tabs), on my lenovo Thinkpad X240, whose LCD display is 12.5", resolution: 1920×1080, PPI of 176.23. BUT, STRANGELY ENOUGH, the issue disappeared two days ago, after a certain reboot. Previous reboots did not solve the issue. So, I don't know why the last reboot fixed it. FYI, I am also connecting from time to time an external HDTV, often for replicating the X240 screen (via the mini-display port and HDMI cable). I don't know whether that matters... Thanks
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