Here's a screencast showing that this only happens when the Colorways `aside` is present. If I explicitly prevent that element from influencing layout by giving it with `display:none`, then the bug goes away. (So: this has to do with that element influencing the size of the grid rows when it's the tallest thing, in a way that we would like to avoid, I think.)
Bug 1789318 Comment 3 Edit History
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Here's a screencast showing that this only happens when the Colorways `aside` is present. If I explicitly prevent that element from influencing layout by giving it with `display:none` (at t=10s in this screencast), then the bug goes away. So: this has to do with that `aside` element influencing the size of the grid rows when it's the tallest thing (which it is when Recently Closed section is collapsed), in a way that we would like to avoid so as to keep the button from unexpectedly jumping out from under the user's cursor.
Here's a screencast showing that this only happens when the Colorways `<aside>` is present. If I explicitly prevent that element from influencing layout by giving it with `display:none` (at t=10s in this screencast), then the bug goes away. So: this has to do with that `<aside>` element influencing the size of the grid rows when it's the tallest thing (which it is when Recently Closed section is collapsed), in a way that we would like to avoid so as to keep the button from unexpectedly jumping out from under the user's cursor.