fix: Do not look for channel in the process of switching profiles

Fixes #36

app-common/src/main/java/im/angry/openeuicc/ui/EuiccManagementFragment.kt

@@ -180,7 +180,7 @@ open class EuiccManagementFragment : Fragment(), EuiccProfilesChangedListener,
                     return@beginTrackedOperation false
                 }
 
-                if (!refreshed && channel.slotId != EuiccChannelManager.USB_CHANNEL_ID) {
+                if (!refreshed && !isUsb) {
                     withContext(Dispatchers.Main) {
                         AlertDialog.Builder(requireContext()).apply {
                             setMessage(R.string.switch_did_not_refresh)
@@ -197,7 +197,7 @@ open class EuiccManagementFragment : Fragment(), EuiccProfilesChangedListener,
                     return@beginTrackedOperation true
                 }
 
-                if (channel.slotId != EuiccChannelManager.USB_CHANNEL_ID) {
+                if (!isUsb) {
                     try {
                         euiccChannelManager.waitForReconnect(
                             slotId,

app-common/src/main/java/im/angry/openeuicc/util/EuiccChannelFragmentUtils.kt

@@ -23,11 +23,13 @@ fun <T> newInstanceEuicc(clazz: Class<T>, slotId: Int, portId: Int, addArguments
     return instance
 }
 
+// Convenient methods to avoid using `channel` for these
+// `channel` requires that the channel actually exists in EuiccChannelManager, which is
+// not always the case during operations such as switching
 val <T> T.slotId: Int where T: Fragment, T: EuiccChannelFragmentMarker
     get() = requireArguments().getInt("slotId")
 val <T> T.portId: Int where T: Fragment, T: EuiccChannelFragmentMarker
     get() = requireArguments().getInt("portId")
-
 val <T> T.isUsb: Boolean where T: Fragment, T: EuiccChannelFragmentMarker
     get() = requireArguments().getInt("slotId") == EuiccChannelManager.USB_CHANNEL_ID