degesch: fix /mode on servers with +channels

degesch.c

@@ -6317,9 +6317,16 @@ handle_command_mode (struct app_context *ctx, char *arguments)
 		return true;
 
 	// FIXME: allow usernames as well, not only channels
-	// FIXME: +channels collide with setting modes
 	struct server *s = ctx->current_buffer->server;
-	char *channel_name = try_get_channel (ctx, &arguments);
+
+	// Channel names prefixed by "+" collide with mode strings,
+	// so we just disallow specifying these channels
+	char *channel_name = NULL;
+	if (*arguments != '+')
+		channel_name = maybe_cut_word (&arguments, validate_channel_name, s);
+	if (!channel_name && ctx->current_buffer->type == BUFFER_CHANNEL)
+		channel_name = ctx->current_buffer->channel->name;
+
 	if (!channel_name)
 		buffer_send_error (ctx, ctx->current_buffer,
 			"%s: %s", "Can't set mode",