Recording without GPS: show a Snackbar to warn user that recording is not using GPS.

src/main/res/layout/track_recording.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
@@ -11,15 +13,23 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
 
-    <androidx.viewpager2.widget.ViewPager2
-        android:id="@+id/track_detail_activity_view_pager"
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
+        android:id="@+id/track_recording_coordinator_layout"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:layout_weight="1" />
+        android:layout_weight="1">
+
+        <androidx.viewpager2.widget.ViewPager2
+            android:id="@+id/track_detail_activity_view_pager"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+    </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/controller_fragment"
         android:name="de.dennisguse.opentracks.ControllerFragment"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
+
 </LinearLayout>