Chrome Version: 59.0.3043.0 (Official Build) canary (64-bit)
OS: macOS 10.12.3, Retina MacBook Pro, NVIDIA GPU

What steps will reproduce the problem?
(1) Create a message in Gmail with a few lines of text with empty lines in between.
(2) Use the arrow keys to move the caret up and down the beginning of these lines.

What is the expected result?

Expect the caret to be displayed correctly.

What happens instead?

The caret is invalidated incorrectly. Very quickly, duplicate copies of the caret are displayed, and it stops blinking as it's supposed to. Attached is one screenshot I was able to easily capture showing a duplicated cursor.

There were a couple of earlier bugs in this area,  Issue 699044  and  Issue 698662 , but the current Canary should have picked up those fixes (I think) and the problems with Gmail are still there.

This problem's been present at least a few weeks, so I'm marking this P1 and ReleaseBlock-Stable. It significantly impacts message editing in Gmail.

Not sure whether this impacts Mac only and/or high-DPI displays only.

 

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