This probably broke some behaviour because converting and splitting from libglade to GtkBuilder is not as perfect as it should be. What I noticed was fixed.
Also, GtkBuilder only allow calling `connect_signals()` once. Some code had to change to handle this and a "handlers proxy class" was created to keep the behaviour we had, ie, connect signals from where it was needed. Then I monkey patch the main windows GtkBuilder to not allow anyone to connect signals through it since it would break behaviour. Connecting signals to the main window builder instance is now done like `component.get("MainWindow").connect_signals()`. The best solution will probably break the main window ui into the needed parts in order to not have to monkey patch main windows builder.
Plugin's trying to get the main windows `main_glade` are now broken, on purpose, ie, the code they have needs to change since the calls to the builder are not the same as the calls to libglade. The plugins we ship with deluge will be fix as soon as possible.
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