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Tristan Van Berkom authored
In preperation for composite objects, for better encapsulation the following APIs are added to allow handling of signals declared in the XML with callbacks declared statically. o gtk_builder_add_callback_symbol[s]() Adds a symbol to the internal symbol hash o gtk_builder_lookup_symbol() Looks up a symbol, exposed in case added symbols are used in conjunction with gtk_builder_connect_signals_full() The default implementation of gtk_builder_connect_signals() now does not have a strong requirement on GModule (or a strong requirement on symbols being declared in the global namespace). Instead GModule is used as a fallback in the case that symbols are not declared explicitly.
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