* applied the logic from BWindow::task_looper() to BLooper as well (messages to

invalid target handlers are dropped).
* B_PREFERRED messages now go to the looper if there is no other preferred handler.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15088 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/Window.cpp

@@ -2243,6 +2243,8 @@ BWindow::task_looper()
 
 				if (usePreferred) {
 					handler = PreferredHandler();
+					if (handler == NULL)
+						handler = this;
 				} else {
 					gDefaultTokens.GetToken(messagePrivate.GetTarget(),
 						B_HANDLER_TOKEN, (void **)&handler);