feat: A border has been added to the contextual menus on the main screen and to the track detail spinner.

fix: It resolves the low contrast that existed between the contextual menus and the rest of the application.
docs: Nothing

Author: AndrewLopezHerrera

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

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="?android:attr/colorBackground" />
+    <stroke
+        android:width="2dp"
+        android:color="#A4A4A4" /> <corners android:radius="4dp" />
+</shape>

app/src/main/res/layout/trackdetail_fields.xml

@@ -71,6 +71,7 @@
         android:layout_marginTop="8dp"
         android:minHeight="48dp"
         android:entries="@array/prefs_osm_visibility_keys"
+        android:popupBackground="@drawable/menu_border_background"
         style="@style/Widget.AppCompat.Spinner.Underlined" />
 
 </merge>

app/src/main/res/values-v14/theme_highcontrast.xml

@@ -4,6 +4,7 @@
 		<!-- item name="android:background">#ffffff</item -->
 		<item name="android:buttonStyle">@style/Widget.Button</item>
 		<item name="android:buttonStyleToggle">@style/Widget.Button.Toggle</item>
+		<item name="actionOverflowMenuStyle">@style/PopupMenu</item>
 	</style>
 
 	<style name="Widget.Button" parent="@android:style/Widget.DeviceDefault.Button">
@@ -14,5 +15,9 @@
 	<style name="Widget.Button.Toggle" parent="@android:style/Widget.DeviceDefault.Button.Toggle">
 			<item name="android:textColor">#ffffff</item>
 	</style>
+	
+	<style name="PopupMenu" parent="Widget.AppCompat.PopupMenu.Overflow">
+		<item name="android:popupBackground">@drawable/menu_border_background</item>
+	</style>
 
 </resources>

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

@@ -8,7 +8,9 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
         -->
-
+        <item name="actionOverflowMenuStyle">@style/PopupMenu</item>
+        <item name="android:contextPopupMenuStyle">@style/PopupMenu</item>
+        <item name="android:panelBackground">@drawable/menu_border_background</item>
     </style>
 
     <!-- Base application theme. -->
@@ -20,4 +22,9 @@
         -->
     </style>
 
+    <style name="PopupMenu" parent="Widget.AppCompat.PopupMenu.Overflow">
+        <item name="android:popupBackground">@drawable/menu_border_background</item>
+    </style>
+
+
 </resources>