modify entities for proper tags navigation

src/main/java/eu/siacs/conversations/entities/Bookmark.java

@@ -195,10 +195,24 @@ public class Bookmark extends Element implements ListItem {
 			return true;
 		}
 		needle = needle.toLowerCase(Locale.US);
+		String[] parts = needle.split("[,\\s]+");
+		if (parts.length > 1) {
+			for (String part : parts) {
+				if (!match(context, part)) {
+					return false;
+				}
+			}
+			return true;
+		} else if (parts.length > 0) {
+			final Jid jid = getJid();
+			return (jid != null && jid.toString().contains(parts[0])) ||
+					getDisplayName().toLowerCase(Locale.US).contains(parts[0]) ||
+					matchInTag(context, parts[0]);
+		} else {
 			final Jid jid = getJid();
 			return (jid != null && jid.toString().contains(needle)) ||
-			getDisplayName().toLowerCase(Locale.US).contains(needle) ||
-			matchInTag(context, needle);
+					getDisplayName().toLowerCase(Locale.US).contains(needle);
+		}
 	}
 
 	private boolean matchInTag(Context context, String needle) {

src/main/java/eu/siacs/conversations/entities/Contact.java

@@ -205,7 +205,7 @@ public class Contact implements ListItem, Blockable {
             return true;
         }
         needle = needle.toLowerCase(Locale.US).trim();
-        String[] parts = needle.split("\\s+");
+        String[] parts = needle.split("[,\\s]+");
         if (parts.length > 1) {
             for (String part : parts) {
                 if (!match(context, part)) {
@@ -213,10 +213,13 @@ public class Contact implements ListItem, Blockable {
                 }
             }
             return true;
+        } else if(parts.length > 0) {
+            return jid.toString().contains(parts[0]) ||
+                    getDisplayName().toLowerCase(Locale.US).contains(parts[0]) ||
+                    matchInTag(context, parts[0]);
         } else {
             return jid.toString().contains(needle) ||
-                    getDisplayName().toLowerCase(Locale.US).contains(needle) ||
-                    matchInTag(context, needle);
+                    getDisplayName().toLowerCase(Locale.US).contains(needle);
         }
     }
 

src/main/java/eu/siacs/conversations/entities/ListItem.java

@@ -3,6 +3,7 @@ package eu.siacs.conversations.entities;
 import android.content.Context;
 
 import java.util.List;
+import java.util.Locale;
 
 import eu.siacs.conversations.services.AvatarService;
 import eu.siacs.conversations.xmpp.Jid;
@@ -31,6 +32,21 @@ public interface ListItem extends Comparable<ListItem>, AvatarService.Avatarable
 		public String getName() {
 			return this.name;
 		}
+
+
+		public String toString() {
+			return getName();
+		}
+
+		public boolean equals(Object o) {
+			if (!(o instanceof Tag)) return false;
+			Tag ot = (Tag) o;
+			return name.toLowerCase(Locale.US).equals(ot.getName().toLowerCase(Locale.US)) && color == ot.getColor();
+		}
+
+		public int hashCode() {
+			return name.toLowerCase(Locale.US).hashCode();
+		}
 	}
 
 	boolean match(Context context, final String needle);