try to fix idn stuff

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

@@ -196,7 +196,7 @@ public class Contact implements ListItem, Blockable {
 			values.put(ACCOUNT, accountUuid);
 			values.put(SYSTEMNAME, systemName);
 			values.put(SERVERNAME, serverName);
-			values.put(JID, jid.toString());
+			values.put(JID, jid.toPreppedString());
 			values.put(OPTIONS, subscription);
 			values.put(SYSTEMACCOUNT, systemAccount);
 			values.put(PHOTOURI, photoUri);

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

@@ -506,7 +506,7 @@ public class Conversation extends AbstractEntity implements Blockable, Comparabl
 		values.put(NAME, name);
 		values.put(CONTACT, contactUuid);
 		values.put(ACCOUNT, accountUuid);
-		values.put(CONTACTJID, contactJid.toString());
+		values.put(CONTACTJID, contactJid.toPreppedString());
 		values.put(CREATED, created);
 		values.put(STATUS, status);
 		values.put(MODE, mode);

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

@@ -205,12 +205,12 @@ public class Message extends AbstractEntity {
 		if (counterpart == null) {
 			values.putNull(COUNTERPART);
 		} else {
-			values.put(COUNTERPART, counterpart.toString());
+			values.put(COUNTERPART, counterpart.toPreppedString());
 		}
 		if (trueCounterpart == null) {
 			values.putNull(TRUE_COUNTERPART);
 		} else {
-			values.put(TRUE_COUNTERPART, trueCounterpart.toString());
+			values.put(TRUE_COUNTERPART, trueCounterpart.toPreppedString());
 		}
 		values.put(BODY, body);
 		values.put(TIME_SENT, timeSent);

src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java

@@ -287,7 +287,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 					continue;
 				}
 				int ownDeviceId = Integer.valueOf(ownDeviceIdString);
-				AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), ownDeviceId);
+				AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), ownDeviceId);
 				deleteSession(db, account, ownAddress);
 				IdentityKeyPair identityKeyPair = loadOwnIdentityKeyPair(db, account);
 				if (identityKeyPair != null) {
@@ -345,7 +345,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 			try {
 				newJid = Jid.fromString(
 						cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
-				).toString();
+				).toPreppedString();
 			} catch (InvalidJidException ignored) {
 				Log.e(Config.LOGTAG, "Failed to migrate Conversation CONTACTJID "
 						+ cursor.getString(cursor.getColumnIndex(Conversation.CONTACTJID))
@@ -578,8 +578,8 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	public Conversation findConversation(final Account account, final Jid contactJid) {
 		SQLiteDatabase db = this.getReadableDatabase();
 		String[] selectionArgs = {account.getUuid(),
-				contactJid.toBareJid().toString() + "/%",
+				contactJid.toBareJid().toPreppedString() + "/%",
-				contactJid.toBareJid().toString()
+				contactJid.toBareJid().toPreppedString()
 		};
 		Cursor cursor = db.query(Conversation.TABLENAME, null,
 				Conversation.ACCOUNT + "=? AND (" + Conversation.CONTACTJID
@@ -691,7 +691,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 				db.insert(Contact.TABLENAME, null, contact.getContentValues());
 			} else {
 				String where = Contact.ACCOUNT + "=? AND " + Contact.JID + "=?";
-				String[] whereArgs = {account.getUuid(), contact.getJid().toString()};
+				String[] whereArgs = {account.getUuid(), contact.getJid().toPreppedString()};
 				db.delete(Contact.TABLENAME, where, whereArgs);
 			}
 		}
@@ -1025,7 +1025,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	}
 
 	private IdentityKeyPair loadOwnIdentityKeyPair(SQLiteDatabase db, Account account) {
-		String name = account.getJid().toBareJid().toString();
+		String name = account.getJid().toBareJid().toPreppedString();
 		IdentityKeyPair identityKeyPair = null;
 		Cursor cursor = getIdentityKeyCursor(db, account, name, true);
 		if (cursor.getCount() != 0) {
@@ -1181,7 +1181,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	}
 
 	public void storeOwnIdentityKeyPair(Account account, IdentityKeyPair identityKeyPair) {
-		storeIdentityKey(account, account.getJid().toBareJid().toString(), true, identityKeyPair.getPublicKey().getFingerprint().replaceAll("\\s", ""), Base64.encodeToString(identityKeyPair.serialize(), Base64.DEFAULT), XmppAxolotlSession.Trust.TRUSTED);
+		storeIdentityKey(account, account.getJid().toBareJid().toPreppedString(), true, identityKeyPair.getPublicKey().getFingerprint().replaceAll("\\s", ""), Base64.encodeToString(identityKeyPair.serialize(), Base64.DEFAULT), XmppAxolotlSession.Trust.TRUSTED);
 	}
 
 

src/main/java/eu/siacs/conversations/xmpp/jid/Jid.java

@@ -21,6 +21,10 @@ public final class Jid {
 	private final String domainpart;
 	private final String resourcepart;
 
+	// It's much more efficient to store the ful JID as well as the parts instead of figuring them
+	// all out every time (since some characters are displayed but aren't used for comparisons).
+	private final String displayjid;
+
 	public String getLocalpart() {
 		return localpart;
 	}
@@ -69,6 +73,7 @@ public final class Jid {
 
 		Jid fromCache = Jid.cache.get(jid);
 		if (fromCache != null) {
+			displayjid = fromCache.displayjid;
 			localpart = fromCache.localpart;
 			domainpart = fromCache.domainpart;
 			resourcepart = fromCache.resourcepart;
@@ -89,6 +94,8 @@ public final class Jid {
 			throw new InvalidJidException(InvalidJidException.INVALID_CHARACTER);
 		}
 
+		String finaljid;
+
 		final int domainpartStart;
 		final int atLoc = jid.indexOf("@");
 		final int slashLoc = jid.indexOf("/");
@@ -96,6 +103,7 @@ public final class Jid {
 		// or there are one or more "@" signs but they're all in the resourcepart (eg. "example.net/@/rp@"):
 		if (atCount == 0 || (atCount > 0 && slashLoc != -1 && atLoc > slashLoc)) {
 			localpart = "";
+			finaljid = "";
 			domainpartStart = 0;
 		} else {
 			final String lp = jid.substring(0, atLoc);
@@ -108,6 +116,7 @@ public final class Jid {
 				throw new InvalidJidException(InvalidJidException.INVALID_PART_LENGTH);
 			}
 			domainpartStart = atLoc + 1;
+			finaljid = lp + "@";
 		}
 
 		final String dp;
@@ -126,6 +135,7 @@ public final class Jid {
 			} catch (final StringprepException e) {
 				throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
 			}
+			finaljid = finaljid + dp + "/" + rp;
 		} else {
 			resourcepart = "";
 			try{
@@ -133,6 +143,7 @@ public final class Jid {
 			} catch (final StringprepException e) {
 				throw new InvalidJidException(InvalidJidException.STRINGPREP_FAIL, e);
 			}
+			finaljid = finaljid + dp;
 		}
 
 		// Remove trailing "." before storing the domain part.
@@ -156,6 +167,8 @@ public final class Jid {
 		}
 
 		Jid.cache.put(jid, this);
+
+		this.displayjid = finaljid;
 	}
 
 	public Jid toBareJid() {
@@ -178,6 +191,10 @@ public final class Jid {
 
 	@Override
 	public String toString() {
+		return displayjid;
+	}
+
+	public String toPreppedString() {
 		String out;
 		if (hasLocalpart()) {
 			out = localpart + '@' + domainpart;