Created attachment 8684633 [details] row-overflow.png See the attached screenshot. The inspector tells me that the row height is 14px but the font size is 14.6667px which I think is the reason for the overflow. I assume this is a Linux only issue as the screenshots in MDN  look a bit better. Namely, the parenthesis in |(no stacks available)| don't leak to the next row but instead stop at the border.  https://mdn.mozillademos.org/files/11901/allocation-view.png
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