Added menu messages dividers

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

@@ -4264,6 +4264,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             }
         });
 
+        MenuCompat.setGroupDividerEnabled(menu, true);
+
         super.onCreateOptionsMenu(menu, inflater);
     }
 

app/src/main/res/menu/menu_messages.xml

@@ -107,6 +107,7 @@
         </menu>
     </item>
 
+    <group android:id="@+id/group_appearance">
         <item
             android:id="@+id/menu_zoom"
             android:icon="@drawable/twotone_format_size_24"
@@ -125,7 +126,9 @@
             app:showAsAction="never">
             <menu />
         </item>
+    </group>
 
+    <group android:id="@+id/group_operations">
         <item
             android:id="@+id/menu_select_all"
             android:title="@string/title_select_all"
@@ -169,4 +172,5 @@
             app:showAsAction="never">
             <menu />
         </item>
+    </group>
 </menu>