Actually, moving to the bottom left of the screen is just as inconsistent as moving to anywhere on the bottom.

It seems like it might be an issue with the angle of the cursor movement, if it moves directly straight down, not diagonally, then the shelf is shown, but if it moves at any angle, it is not shown.

If the cursor is moved slow enough, moving it at an angle works, but moving it quickly causes the shelf to not slide in.

Perhaps related?

https://bugs.chromium.org/p/chromium/issues/detail?id=828542

Malay, do you think this is related to 828542?

I dont think this is related to Display zoom. It seems like the shelf shows up only when the mouse cursor stops moving. Have we changed the way the shelf responds?

Well, this doesn't happen when the display is set to 100% zoom, so it's definitely related, somehow.

In 828542:

> 1. This one only happens at 130% and 145% zoom: Activation point of the auto hide shelf is above the bottom by a few pixels. Because of this if the mouse pointer is moved faster than a certain speed to the bottom, the shelf will not appear. It appears when the cursor is moved slightly up. 

This is relevant... not the zoom levels, but the activation point of the shelf. Perhaps there is some code that watches for the cursor to quit moving. If you get the cursor close to the edge of the screen where the shelf is, and move it slowly, the shelf appears as expected, but if you move it quickly, the shelf does not appear. I could see this maybe being a "feature" to prevent accidental shelf un-hide, but really, if you move the cursor to the edge, and leave it there, the shelf should appear IMO.

Seems to me like the display zoom is messing up the shelf activation points. I don't know what causes it, but this is 100% reproducible.

I see what you mean. I assumed it was working for the left side of the shelf.

Yes, Issue 828542 (1) may result in the bottom 1px and right 1 pixel to stop responding at certain zoom levels. This is due to the rounding down of values.

For what it's worth, in 67.0.3396.49 the display sizing now uses an absolute resolution, not a percentage zoom level, and this is no longer reproducible.

Never mind... I had to re-enable "Enable display zoom settings" in chrome://flags and when I change it, the behavior is still reproducible.

For now, I will just use resolution instead of zoom scaling.

Duplicate of  Issue 843354 ?

Yes