[Pidgin] #15813: PurpleSrvTxtQueryUiOps doesn't seem to work for TXT queries

[Pidgin]

#15813: PurpleSrvTxtQueryUiOps doesn't seem to work for TXT queries
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 Reporter:  dsumorok  |      Owner:
     Type:  defect    |     Status:  new
Milestone:            |  Component:  libpurple
  Version:  2.10.7    |   Keywords:
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 The resolve() UI function in the PurpleSrvTxtQueryUiOps structure
 (dnssrv.h) does not specify whether the lookup is a SRV lookup or a TXT
 lookup.  Furthermore, if it is a TXT lookup, and the lookup fails,
 purple_srv_txt_query_ui_resolve() (in dnssrv.c) calls the txt callback
 with the srv arguments (since the "srv" and "txt" callback pointers are
 part of the same union, in the _PurpleSrvTxtQueryData structure,
 query_data->cb.srv will be the same as query_data->cb.txt).  This
 invariably causes a crash.

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Ticket URL: <https://developer.pidgin.im/ticket/15813>
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