synchronized around cache clear in avatar service

src/main/java/eu/siacs/conversations/services/AvatarService.java

@@ -58,11 +58,13 @@ public class AvatarService {
 	}
 
 	public void clear(Contact contact) {
+		synchronized (this.sizes) {
 			for (Integer size : sizes) {
 				this.mXmppConnectionService.getBitmapCache().remove(
 						key(contact, size));
 			}
 		}
+	}
 
 	private String key(Contact contact, int size) {
 		synchronized (this.sizes) {
@@ -150,11 +152,13 @@ public class AvatarService {
 	}
 
 	public void clear(MucOptions options) {
+		synchronized (this.sizes) {
 			for (Integer size : sizes) {
 				this.mXmppConnectionService.getBitmapCache().remove(
 						key(options, size));
 			}
 		}
+	}
 
 	private String key(MucOptions options, int size) {
 		synchronized (this.sizes) {
@@ -182,11 +186,13 @@ public class AvatarService {
 	}
 
 	public void clear(Account account) {
+		synchronized (this.sizes) {
 			for (Integer size : sizes) {
 				this.mXmppConnectionService.getBitmapCache().remove(
 						key(account, size));
 			}
 		}
+	}
 
 	private String key(Account account, int size) {
 		synchronized (this.sizes) {

src/main/res/menu/muc_details_context.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+</menu>