Fix LoggingPlugin backbuffer not working, and open/close events going to the wrong file.

logging/src/main/java/com/dmdirc/addons/logging/LogFileLocator.java

         return getPath(directory, file, user.getNickname());
     }
 
-    /**
-     * Get the name of the log file for a specific object.
-     *
-     * @param descriptor Description of the object to get a log file for.
-     *
-     * @return the name of the log file to use for this object.
-     */
-    public String getLogFile(@Nullable final String descriptor) {
-        final StringBuffer directory = getLogDirectory();
-        final StringBuffer file = new StringBuffer();
-        final String md5String;
-        if (descriptor == null) {
-            file.append("null.log");
-            md5String = "";
-        } else {
-            file.append(sanitise(descriptor.toLowerCase()));
-            md5String = descriptor;
-        }
-        return getPath(directory, file, md5String);
-    }
-
     /**
      * Gets the path for the given file and directory. Only intended to be used from getLogFile
      * methods.

logging/src/main/java/com/dmdirc/addons/logging/LoggingManager.java

 
     @Handler
     public void handleChannelOpened(final ChannelOpenedEvent event) {
-        final String filename = locator.getLogFile(event.getChannel().getName());
+        final String filename = locator.getLogFile(event.getChannel());
+        System.out.println("\tChannel opened filename: " + filename);
 
         if (autobackbuffer) {
             showBackBuffer(event.getChannel().getWindowModel(), filename);
 
     @Handler
     public void handleChannelClosed(final ChannelClosedEvent event) {
-        final String filename = locator.getLogFile(event.getChannel().getName());
+        final String filename = locator.getLogFile(event.getChannel());
 
         synchronized (FORMAT_LOCK) {
             appendLine(filename, "*** Channel closed at: %s", OPENED_AT_FORMAT.format(new Date()));
      * @return True if the history is available, false otherwise
      */
     protected boolean showHistory(final WindowModel target) {
-        final String descriptor;
+        final Path log;
 
         if (target instanceof GroupChat) {
-            descriptor = target.getName();
+            log = Paths.get(locator.getLogFile((GroupChat)target));
         } else if (target instanceof Query) {
-            descriptor = ((PrivateChat) target).getNickname();
+            log = Paths.get(locator.getLogFile(((PrivateChat) target).getUser()));
         } else {
             // Unknown component
             return false;
         }
 
-        final Path log = Paths.get(locator.getLogFile(descriptor));
+
 
         if (!Files.exists(log)) {
             // File doesn't exist