SaveKeyView: add spacers to make Text frames invariant upon Copy-tap

Closes: #192

damus/Views/SaveKeysView.swift

@@ -147,6 +147,9 @@ struct SaveKeyView: View {
     
     var body: some View {
         HStack {
+            Spacer()
+            VStack {
+                spacerBlock(width: 0, height: 0)
                 Button(action: copy_text) {
                     Label("", systemImage: is_copied ? "checkmark.circle.fill" : "doc.on.doc")
                         .foregroundColor(is_copied ? .green : .white)
@@ -162,6 +165,7 @@ struct SaveKeyView: View {
                             }
                         }
                 }
+            }
           
             Text(text)
                 .padding(5)
@@ -174,7 +178,14 @@ struct SaveKeyView: View {
                 .onTapGesture {
                     copy_text()
                 }
+            
+            spacerBlock(width: 0, height: 0) /// set a 'width' > 0 here to vary key Text's aspect ratio
+        }
     }
+    
+    @ViewBuilder private func spacerBlock(width: CGFloat, height: CGFloat) -> some View {
+        Color.orange.opacity(1)
+            .frame(width: width, height: height)
     }
 }