Style popup menu scroll bar

app/src/main/java/eu/faircode/email/PopupMenuLifecycle.java

@@ -25,6 +25,7 @@ import android.view.View;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.appcompat.view.ContextThemeWrapper;
 import androidx.appcompat.widget.PopupMenu;
 import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.LifecycleObserver;
@@ -34,7 +35,7 @@ import androidx.lifecycle.OnLifecycleEvent;
 public class PopupMenuLifecycle extends PopupMenu implements LifecycleObserver {
 
     public PopupMenuLifecycle(@NonNull Context context, LifecycleOwner owner, @NonNull View anchor) {
-        super(context, anchor);
+        super(new ContextThemeWrapper(context, R.style.popupMenuStyle), anchor);
         Log.i("Instantiate " + this);
 
         owner.getLifecycle().addObserver(this);

app/src/main/res/drawable/scroll_thumb_popup.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="?attr/colorAccent" />
+</shape>

app/src/main/res/drawable/scroll_track_popup.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="?attr/colorSeparator" />
+</shape>

app/src/main/res/values/styles.xml

@@ -444,4 +444,10 @@
         <item name="android:textAppearance">@style/TextAppearance.AppCompat.Small</item>
         <item name="android:textColor">?android:attr/textColorSecondary</item>
     </style>
+
+    <style name="popupMenuStyle" parent="Base.Widget.AppCompat.PopupMenu">
+        <item name="android:scrollbarSize">6dp</item>
+        <item name="android:scrollbarThumbVertical">@drawable/scroll_thumb_popup</item>
+        <item name="android:scrollbarTrackVertical">@drawable/scroll_track_popup</item>
+    </style>
 </resources>