Add SUPPRESS_NOTIFICATIONS flag for message

src/main/java/net/dv8tion/jda/api/entities/Message.java

@@ -1947,6 +1947,15 @@ default MessageCreateAction replyFiles(@Nonnull Collection<? extends FileUpload>
      */
     boolean isEphemeral();
 
+    /**
+     * Whether this message is silent.
+     * <br>The message being silent means it will not trigger push and desktop notifications
+     * <br>This is a shortcut method for checking if {@link #getFlags()} contains {@link MessageFlag#NOTIFICATIONS_SUPPRESSED}
+     *
+     * @return Whether the message is silent
+     */
+    boolean isSilent();
+
     /**
      * Returns a possibly {@code null} {@link ThreadChannel ThreadChannel} that was started from this message.
      * This can be {@code null} due to no ThreadChannel being started from it or the ThreadChannel later being deleted.
@@ -2129,7 +2138,12 @@ enum MessageFlag
         /**
          * Indicates, that this Message is an interaction response and the bot is "thinking"
          */
-        LOADING(7);
+        LOADING(7),
+        /**
+         * Indicates, that this message will not trigger push and desktop notifications
+         * @see Message#isSilent
+         */
+        NOTIFICATIONS_SUPPRESSED(12);
 
         private final int value;
 

src/main/java/net/dv8tion/jda/api/utils/messages/AbstractMessageBuilder.java

@@ -255,6 +255,7 @@ public R clear()
         this.components.clear();
         this.content.setLength(0);
         this.mentions.clear();
+        this.messageFlags = 0;
         return (R) this;
     }
 

src/main/java/net/dv8tion/jda/api/utils/messages/MessageCreateBuilder.java

@@ -208,6 +208,17 @@ public MessageCreateBuilder setTTS(boolean tts)
         return this;
     }
 
+    @Nonnull
+    @Override
+    public MessageCreateBuilder setSilent(boolean silent)
+    {
+        if(silent)
+            messageFlags |= Message.MessageFlag.NOTIFICATIONS_SUPPRESSED.getValue();
+        else
+            messageFlags &= ~Message.MessageFlag.NOTIFICATIONS_SUPPRESSED.getValue();
+        return this;
+    }
+
     @Override
     public boolean isEmpty()
     {

src/main/java/net/dv8tion/jda/api/utils/messages/MessageCreateData.java

@@ -253,6 +253,16 @@ public boolean isTTS()
         return tts;
     }
 
+    /**
+     * Whether this message is silent.
+     *
+     * @return True, if the message will not trigger push and desktop notifications
+     */
+    public boolean isSilent()
+    {
+        return (flags & Message.MessageFlag.NOTIFICATIONS_SUPPRESSED.getValue()) != 0;
+    }
+
     /**
      * The IDs for users which are allowed to be mentioned, or an empty list.
      *

src/main/java/net/dv8tion/jda/api/utils/messages/MessageCreateRequest.java

@@ -310,6 +310,18 @@ default R addFiles(@Nonnull FileUpload... files)
     @Nonnull
     R setTTS(boolean tts);
 
+    /**
+     * Set whether this message should trigger push/desktop notifications to other users.
+     * <br>When a message is silent, it will not trigger push/desktop notifications.
+     *
+     * @param  silent
+     *         True, if this message should not trigger push/desktop notifications
+     *
+     * @return The same reply action, for chaining convenience
+     */
+    @Nonnull
+    R setSilent(boolean silent);
+
     /**
      * Applies the provided {@link MessageCreateData} to this request.
      *
@@ -336,6 +348,7 @@ default R applyData(@Nonnull MessageCreateData data)
                 .mentionRepliedUser(data.isMentionRepliedUser())
                 .setEmbeds(data.getEmbeds())
                 .setTTS(data.isTTS())
+                .setSilent(data.isSilent())
                 .setComponents(layoutComponents)
                 .setFiles(data.getFiles());
     }
@@ -352,6 +365,7 @@ default R applyMessage(@Nonnull Message message)
         return setContent(message.getContentRaw())
                 .setEmbeds(embeds)
                 .setTTS(message.isTTS())
+                .setSilent(message.isSilent())
                 .setComponents(message.getActionRows());
     }
 

src/main/java/net/dv8tion/jda/internal/entities/AbstractMessage.java

@@ -472,6 +472,13 @@ public boolean isEphemeral()
         return false;
     }
 
+    @Override
+    public boolean isSilent()
+    {
+        unsupported();
+        return false;
+    }
+
     @Nullable
     @Override
     public ThreadChannel getStartedThread()

src/main/java/net/dv8tion/jda/internal/entities/ReceivedMessage.java

@@ -680,6 +680,12 @@ public boolean isEphemeral()
         return (this.flags & MessageFlag.EPHEMERAL.getValue()) != 0;
     }
 
+    @Override
+    public boolean isSilent()
+    {
+        return (this.flags & MessageFlag.NOTIFICATIONS_SUPPRESSED.getValue()) != 0;
+    }
+
     @Nullable
     @Override
     public ThreadChannel getStartedThread()

src/main/java/net/dv8tion/jda/internal/utils/message/MessageCreateBuilderMixin.java

@@ -84,4 +84,12 @@ default List<FileUpload> getAttachments()
     {
         return getBuilder().getAttachments();
     }
+
+    @Nonnull
+    @Override
+    default R setSilent(boolean silent)
+    {
+        getBuilder().setSilent(silent);
+        return (R) this;
+    }
 }