Gets the text of @proposal. The text that is inserted into
the text buffer when the proposal is activated by the default activation.
You are free to implement a custom activation handler in the provider and
not implement this function. For more information, see
gtk_source_completion_provider_activate_proposal(). The returned string must
be freed with g_free().
Gets the text of @proposal. The text that is inserted into the text buffer when the proposal is activated by the default activation. You are free to implement a custom activation handler in the provider and not implement this function. For more information, see gtk_source_completion_provider_activate_proposal(). The returned string must be freed with g_free().