Japanese font without Japanese character causes the clip at the bottom. The final workaround.

JapaneseFontProblem.swift

import SwiftUI

struct SmapleView: View {

    let ctFont = CTFontCreateWithName("HiraginoSans-W3" as CFString, 50, nil)
    var ctFontDescender: CGFloat {
        CTFontGetDescent(ctFont)
    }
    let borderColor = Color(.systemBlue)

    var body: some View {

        VStack(spacing: 20) {
            HStack(spacing: 10) {
                Text("Copy")
                    .font(.init(ctFont))
                    .border(borderColor)
                
                Text("Copy")
                    .font(.init(ctFont))
                    .baselineOffset(ctFontDescender)
                    .offset(y: descent / 2)
//                    .padding(.top, ctFontDescender)
                    .border(borderColor)
            }

            HStack(spacing: 10) {
                Text("コピー")
                    .font(.init(ctFont))
                    .border(borderColor)
                
                Text("コピー")
                    .font(.init(ctFont))
                    .baselineOffset(ctFontDescender)
                    .offset(y: descent / 2)
//                     .padding(.top, ctFontDescender)
                    .border(borderColor)
            }
        }
    }
}

struct SmapleView_Previews: PreviewProvider {
    static var previews: some View {
        SmapleView()
    }
}

• Japanese font causes clipping.
  https://gist.github.com/Koze/6a987981ae2d68a1d71d9d21cf77b0e6
• Setting Text frame doesn't work.
  https://gist.github.com/Koze/17050bcdab3e578aff993f193e27a45a
• Using baselineOffset works.
  https://gist.github.com/Koze/e32b833b2150313f4637414b2b76da0d
• Using CTFont instead with Font and UIFont.
  https://gist.github.com/Koze/52e7cce4dac069592fbcfdeca4d2ec97
• Using offset (or padding) for adjustment.
  https://gist.github.com/Koze/376b0ff231107569f073f026eac2e688 ←
• Refactor as extension.
  https://gist.github.com/Koze/bd1285ab6471528e3e22cd8de3d64804