fix: swipe between receive tabs from the usdt qr

Bitkit/Extensions/View+SwipeGestures.swift

@@ -14,33 +14,41 @@ extension View {
     // MARK: Segmented tab swipes
 
     /// Swipe left/right to move between adjacent tabs (same order as `T.allCases` / `SegmentedControl`).
+    /// Pass `tabs` when the control shows only some cases, in its display order.
+    /// Pass `simultaneous` inside a sheet, so a vertical drag still reaches the sheet's swipe-to-dismiss.
+    @ViewBuilder
     func swipeSegmentedTabs<T: Hashable & CaseIterable>(
         selection: Binding<T>,
+        tabs visibleTabs: [T]? = nil,
         minimumDragDistance: CGFloat = 20,
         swipeThreshold: CGFloat = 50,
-        animation: Animation = .easeInOut(duration: 0.2)
+        animation: Animation = .easeInOut(duration: 0.2),
+        simultaneous: Bool = false
     ) -> some View {
-        highPriorityGesture(
-            DragGesture(minimumDistance: minimumDragDistance, coordinateSpace: .local)
-                .onEnded { value in
-                    let horizontalAmount = value.translation.width
-                    let verticalAmount = value.translation.height
-                    guard abs(horizontalAmount) > abs(verticalAmount) else { return }
-
-                    let tabs = Array(T.allCases)
-                    guard let currentIndex = tabs.firstIndex(of: selection.wrappedValue) else { return }
-
-                    if horizontalAmount < -swipeThreshold, currentIndex < tabs.count - 1 {
-                        withAnimation(animation) {
-                            selection.wrappedValue = tabs[currentIndex + 1]
-                        }
-                    } else if horizontalAmount > swipeThreshold, currentIndex > 0 {
-                        withAnimation(animation) {
-                            selection.wrappedValue = tabs[currentIndex - 1]
-                        }
+        let drag = DragGesture(minimumDistance: minimumDragDistance, coordinateSpace: .local)
+            .onEnded { value in
+                let horizontalAmount = value.translation.width
+                let verticalAmount = value.translation.height
+                guard abs(horizontalAmount) > abs(verticalAmount) else { return }
+
+                let tabs = visibleTabs ?? Array(T.allCases)
+                guard let currentIndex = tabs.firstIndex(of: selection.wrappedValue) else { return }
+
+                if horizontalAmount < -swipeThreshold, currentIndex < tabs.count - 1 {
+                    withAnimation(animation) {
+                        selection.wrappedValue = tabs[currentIndex + 1]
+                    }
+                } else if horizontalAmount > swipeThreshold, currentIndex > 0 {
+                    withAnimation(animation) {
+                        selection.wrappedValue = tabs[currentIndex - 1]
                     }
                 }
-        )
+            }
+        if simultaneous {
+            simultaneousGesture(drag)
+        } else {
+            highPriorityGesture(drag)
+        }
     }
 }
 

Bitkit/Views/Wallets/UsdtReceiveView.swift

@@ -70,6 +70,7 @@ struct UsdtReceiveView: View {
                     onEdit: { draftAmount = amount; page = .amount },
                     onNetwork: { page = .networks }
                 )
+                .swipeSegmentedTabs(selection: Binding(get: { .usdt }, set: onSelectTab), tabs: tabs.map(\.tab), simultaneous: true)
             case .networks:
                 networkList
             case .amount:

changelog.d/next/1020.fixed.md

@@ -0,0 +1 @@
+Swiping over the USDT receive QR now moves to the previous tab.

journeys/receive/usdt-receive-swipe-tabs.xml

@@ -0,0 +1,30 @@
+<journey name="usdt receive swipe tabs">
+  <description>
+    On the Receive sheet, swiping sideways over the QR changes tabs on every tab, USDT included.
+    With USDT selected, a swipe to the right over its QR selects the tab before it (Spending) and
+    does not copy the address; a swipe to the left does nothing, since USDT is the last tab. A single
+    tap on the USDT QR still copies the address and shows the "copied" tooltip.
+
+    Precondition: onboarded dev wallet with USDT enabled (introductory sheet or Settings, General,
+    Payments), no CJIT invoice pending, start on the wallet home screen. The USDT address loads
+    without funding; wait for the QR before swiping.
+
+    The copy shows as a tooltip over the QR for about two seconds, so a check for "no copy" reads a
+    screenshot taken right after the swipe. Swipe with AXe (`axe swipe --start-x 80 --start-y 420
+    --end-x 320 --end-y 420 --duration 0.3 --udid <udid>` on a 390 pt wide simulator) across the
+    middle of the QR, about 60% of its width. On a wallet without a Lightning channel, Spending shows
+    its setup view instead of a QR.
+
+    iOS: the return from Spending to USDT goes through the paged `TabView`, which moves on a 300 ms
+    swipe as well; the 600 ms in that step is kept so the two platforms run the same action.
+  </description>
+  <actions>
+    <action>Tap Receive (id "Receive")</action>
+    <action>Tap the USDT tab (id "Tab-usdt") and wait until the USDT QR is visible</action>
+    <action>Swipe right across the QR and take a screenshot right away</action>
+    <action>Verify the Spending tab (id "Tab-spending") is selected, the Lightning receive content or the Spending setup is shown, and the screenshot shows no "copied" tooltip</action>
+    <action>Swipe left across the middle of the Spending content, whether it shows a Lightning QR or the Spending setup, in 600 ms (`axe swipe --start-x 320 --start-y 420 --end-x 80 --end-y 420 --duration 0.6`); verify the USDT tab is selected and wait until its QR is visible</action>
+    <action>Swipe left across the USDT QR and take a screenshot right away; verify the USDT tab stays selected and the screenshot shows no "copied" tooltip</action>
+    <action>Tap the USDT QR once and verify the "copied" tooltip appears</action>
+  </actions>
+</journey>