replace /me when quoting messages. fixes #3669

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

@@ -143,6 +143,16 @@ public class Contact implements ListItem, Blockable {
 		}
 	}
 
+	public String getPublicDisplayName() {
+		if (!TextUtils.isEmpty(this.presenceName)) {
+			return this.presenceName;
+		} else if (jid.getLocal() != null) {
+			return JidHelper.localPartOrFallback(jid);
+		} else {
+			return jid.getDomain().toEscapedString();
+		}
+	}
+
 	public String getProfilePhoto() {
 		return this.photoUri;
 	}

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

@@ -643,8 +643,8 @@ public class Message extends AbstractEntity implements AvatarService.Avatarable
 						!this.isOOb() &&
 						!message.treatAsDownloadable() &&
 						!this.treatAsDownloadable() &&
-						!message.getBody().startsWith(ME_COMMAND) &&
-						!this.getBody().startsWith(ME_COMMAND) &&
+						!message.hasMeCommand() &&
+						!this.hasMeCommand() &&
 						!this.bodyIsOnlyEmojis() &&
 						!message.bodyIsOnlyEmojis() &&
 						((this.axolotlFingerprint == null && message.axolotlFingerprint == null) || this.axolotlFingerprint.equals(message.getFingerprint())) &&

src/main/java/eu/siacs/conversations/utils/MessageUtils.java

@@ -29,10 +29,13 @@
 
 package eu.siacs.conversations.utils;
 
+import com.google.common.base.Strings;
+
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.regex.Pattern;
 
+import eu.siacs.conversations.entities.Conversational;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.http.AesGcmURLStreamHandler;
 import eu.siacs.conversations.http.P1S3UrlStreamHandler;
@@ -45,7 +48,22 @@ public class MessageUtils {
 
 	public static String prepareQuote(Message message) {
 		final StringBuilder builder = new StringBuilder();
-		final String body = message.getMergedBody().toString();
+		final String body;
+		if (message.hasMeCommand()) {
+			final String nick;
+			if (message.getStatus() == Message.STATUS_RECEIVED) {
+				if (message.getConversation().getMode() == Conversational.MODE_MULTI) {
+					nick = Strings.nullToEmpty(message.getCounterpart().getResource());
+				} else {
+					nick = message.getContact().getPublicDisplayName();
+				}
+			} else {
+				nick =  UIHelper.getMessageDisplayName(message);
+			}
+			body = nick + " " + message.getBody().substring(Message.ME_COMMAND.length());
+		} else {
+			body = message.getMergedBody().toString();;
+		}
 		for (String line : body.split("\n")) {
 			if (line.length() <= 0) {
 				continue;