wireless: a car you said no to can be let to connect on its own again, from the car list

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/WirelessButton.kt

@@ -116,6 +116,21 @@ internal fun WirelessButton() {
                                 }
                                 .padding(vertical = 14.dp),
                         )
+                        // A car the driver once said no to never asks again, so offer the way back here.
+                        if (app.seb3thehacker.gearslip.wireless.WirelessAuto.declinedEarlier(context, device)) {
+                            Text(
+                                stringResource(R.string.wireless_auto_off),
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                            TextButton(
+                                onClick = {
+                                    devices = null
+                                    app.seb3thehacker.gearslip.wireless.WirelessAuto.askAgain(context, device)
+                                },
+                                modifier = Modifier.padding(bottom = 4.dp),
+                            ) { Text(stringResource(R.string.wireless_auto_turn_on)) }
+                        }
                     }
                     // The car has to be paired before it shows up here, and pairing happens in Android's settings.
                     if (list.isNotEmpty()) {

gearslip/src/main/java/app/seb3thehacker/gearslip/wireless/WirelessAuto.kt

@@ -72,6 +72,20 @@ object WirelessAuto {
         }, Handler(Looper.getMainLooper()))
     }
 
+    /** True when the driver said no to this car connecting by itself, and it still can't. */
+    fun declinedEarlier(context: Context, device: BluetoothDevice): Boolean {
+        val manager = context.getSystemService(CompanionDeviceManager::class.java) ?: return false
+        return !isCompanion(manager, device.address) &&
+            context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).getBoolean(device.address, false)
+    }
+
+    /** Forgets the earlier no and shows Android's dialog for [device] again. */
+    fun askAgain(context: Context, device: BluetoothDevice) {
+        log.i("auto-connect: asking again about ${WirelessLink.name(device)}")
+        context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).edit().remove(device.address).apply()
+        connectedByHand(context, device)
+    }
+
     /** The driver allowed it in Android's dialog. */
     fun approved(context: Context, address: String) {
         log.i("auto-connect: allowed")