fix single payment output label

When a transaction has only one payment,
then its txid label is attached to the payment label.
While modifying the label of an output it did not change the
whole transaction label, which is a bug.

gui/src/app/view/home.rs

@@ -325,6 +325,7 @@ pub fn payment_view<'a>(
                 },
                 &tx.labels,
                 labels_editing,
+                tx.is_single_payment().is_some(),
             ))
             .spacing(20),
     )

gui/src/app/view/psbt.rs

@@ -82,6 +82,7 @@ pub fn psbt_view<'a>(
                 Some(tx.change_indexes.clone()),
                 &tx.labels,
                 labels_editing,
+                tx.is_single_payment().is_some(),
             ))
             .push(if saved {
                 Row::new()
@@ -542,6 +543,7 @@ pub fn inputs_and_outputs_view<'a>(
     change_indexes: Option<Vec<usize>>,
     labels: &'a HashMap<String, String>,
     labels_editing: &'a HashMap<String, form::Value<String>>,
+    is_single_payment: bool,
 ) -> Element<'a, Message> {
     let change_indexes_copy = change_indexes.clone();
     Column::new()
@@ -674,6 +676,7 @@ pub fn inputs_and_outputs_view<'a>(
                                         network,
                                         labels,
                                         labels_editing,
+                                        is_single_payment,
                                     ))
                                 },
                             )
@@ -825,6 +828,7 @@ fn payment_view<'a>(
     network: Network,
     labels: &'a HashMap<String, String>,
     labels_editing: &'a HashMap<String, form::Value<String>>,
+    is_single: bool,
 ) -> Element<'a, Message> {
     let addr = Address::from_script(&output.script_pubkey, network)
         .ok()
@@ -834,6 +838,13 @@ fn payment_view<'a>(
         vout: i as u32,
     }
     .to_string();
+    // if the payment is single in the transaction, then the label of the txid
+    // is attached to the label of the payment.
+    let change_labels = if is_single {
+        vec![outpoint.clone(), txid.to_string()]
+    } else {
+        vec![outpoint.clone()]
+    };
     Column::new()
         .width(Length::Fill)
         .spacing(5)
@@ -843,13 +854,9 @@ fn payment_view<'a>(
                 .align_items(Alignment::Center)
                 .push(
                     Container::new(if let Some(label) = labels_editing.get(&outpoint) {
-                        label::label_editing(vec![outpoint.clone()], label, text::P1_SIZE)
+                        label::label_editing(change_labels, label, text::P1_SIZE)
                     } else {
-                        label::label_editable(
-                            vec![outpoint.clone()],
-                            labels.get(&outpoint),
-                            text::P1_SIZE,
-                        )
+                        label::label_editable(change_labels, labels.get(&outpoint), text::P1_SIZE)
                     })
                     .width(Length::Fill),
                 )

gui/src/app/view/spend/mod.rs

@@ -56,6 +56,7 @@ pub fn spend_view<'a>(
                 Some(tx.change_indexes.clone()),
                 &tx.labels,
                 labels_editing,
+                tx.is_single_payment().is_some(),
             ))
             .push(if saved {
                 Row::new()

gui/src/app/view/transactions.rs

@@ -260,6 +260,7 @@ pub fn tx_view<'a>(
                 },
                 &tx.labels,
                 labels_editing,
+                tx.is_single_payment().is_some(),
             ))
             .spacing(20),
     )