I tested the attached patch in a local build, and I confirmed that the issue does seem to be fixed with the patch. (The border shows up and looks good to me.) Thanks, mconley!
Bug 1846624 Comment 8 Edit History
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I tested the attached patch in a local build, and I confirmed that the issue does seem to be fixed with the patch. (The border shows up and looks good to me. I tested with both dark and light color-scheme preference.) Thanks, mconley!