Delete public chat messages locally if not stored on the server

js/models/conversations.js

@@ -2425,11 +2425,20 @@
       if (!channelAPI) {
         return false;
       }
-      const success = await channelAPI.deleteMessage(message.getServerId());
-      if (success) {
+      const serverId = message.getServerId();
+
+      const success = serverId
+        ? await channelAPI.deleteMessage(serverId)
+        : false;
+
+      const shouldDeleteLocally = success || message.hasErrors() || !serverId;
+      // If the message has errors it is likely not saved
+      // on the server, so we delete it locally unconditionally
+      if (shouldDeleteLocally) {
         this.removeMessage(message.id);
       }
-      return success;
+
+      return shouldDeleteLocally;
     },
 
     removeMessage(messageId) {

js/views/conversation_view.js

@@ -1335,10 +1335,7 @@
         ? i18n('deletePublicWarning')
         : i18n('deleteWarning');
 
-      const dialog = new Whisper.ConfirmationDialogView({
-        message: warningMessage,
-        okText: i18n('delete'),
-        resolve: async () => {
+      const doDelete = async () => {
         if (this.model.isPublic()) {
           const success = await this.model.deletePublicMessage(message);
           if (!success) {
@@ -1354,7 +1351,18 @@
         message.trigger('unload');
         this.resetPanel();
         this.updateHeader();
-        },
+      };
+
+      // The message wasn't saved, so we don't show any warning
+      if (message.hasErrors()) {
+        doDelete();
+        return;
+      }
+
+      const dialog = new Whisper.ConfirmationDialogView({
+        message: warningMessage,
+        okText: i18n('delete'),
+        resolve: doDelete,
       });
 
       this.$el.prepend(dialog.el);