Sort in slot selectable subscriptions first

Then the ones that not in slot.

Bug: 340361264
Test: manual - on SIMs
Test: unit test
Change-Id: If7150bd2fa5c1b7d42fe34ef2e814ba540454ed8

src/com/android/settings/network/telephony/SubscriptionRepository.kt

@@ -124,6 +124,14 @@ fun Context.getSelectableSubscriptionInfoList(): List<SubscriptionInfo> {
             }
         }
         // Matching the sorting order in SubscriptionManagerService.getAvailableSubscriptionInfoList
-        .sortedWith(compareBy({ it.simSlotIndex }, { it.subscriptionId }))
+        .sortedWith(compareBy({ it.sortableSimSlotIndex }, { it.subscriptionId }))
         .also { Log.d(TAG, "getSelectableSubscriptionInfoList: $it") }
 }
+
+/** Subscription with invalid sim slot index has lowest sort order. */
+private val SubscriptionInfo.sortableSimSlotIndex: Int
+    get() = if (simSlotIndex != SubscriptionManager.INVALID_SIM_SLOT_INDEX) {
+        simSlotIndex
+    } else {
+        Int.MAX_VALUE
+    }