I noticed another issue. See attached When the expander button is clicked, contents shift to the right temporarily. (this is same regression range)
Bug 1599783 Comment 15 Edit History
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if text size bigger 125% in Windows(Select the Start button, then select Settings > Ease of Access > Display. To make just the text on your screen larger, adjust the slider under Make text bigger. ) I noticed another issue. See attached. When the expander button is clicked, contents shift to the right temporarily. (this is same regression range)