pidgin/pidgin

Fix incompatible type conversion errors
release-2.x.y
4 months ago, Elliott Sales de Andrade
488055ab5531
Fix incompatible type conversion errors

- A recent libxml2 changed its handler function to take a `const` pointer. It's
safe for us to have it, and them not, but the opposite way causes an implicit
cast warning.
- In relatively new GLib (many years now), `g_object_ref` casts its output to
match its input. This means we should not be casting to `G_OBJECT`, as that
is not the type it expects, and would translate to the output being `GObject`
instead of the original type.

This fixes the build in Fedora 40, which changes several incompatible pointer
conversion warnings into errors.

This patch is partially from the Fedora maintainer @yarda, with some corrections by me (to the `g_object_ref` portions.)

Testing Done:
Compiled in a Rawhide environment with this patch applied.

Bugs closed: PIDGIN-17850

Reviewed at https://reviews.imfreedom.org/r/2944/
/** @page notify-signals Notification Signals
@signals
@signal displaying-userinfo
@signal displaying-email-notification
@signal displaying-emails-notification
@endsignals
@see notify.h
@signaldef displaying-userinfo
@signalproto
void (*displaying_userinfo)(PurpleAccount *account, const char *who, PurpleNotifyUserInfo *user_info);
@endsignalproto
@signaldesc
Emitted before userinfo is handed to the UI to display.
@a user_info can be manipulated via the PurpleNotifyUserInfo API in notify.c.
@note
If adding a PurpleNotifyUserInfoEntry, be sure not to free it -- PurpleNotifyUserInfo assumes responsibility for its objects.
@param account The account on which the info was obtained.
@param who The name of the buddy whose info is to be displayed.
@param user_info The information to be displayed, as PurpleNotifyUserInfoEntry objects
@endsignaldef
@signaldef displaying-email-notification
@signalproto
void (*displaying_email_notification)(const char *subject,
const char *from,
const char *to,
const char *url);
@endsignalproto
@signaldesc
Emitted before notification of a single email is handed to the UI to display.
@param subject Subject of email being notified of.
@param from Who the email is from.
@param to Who the email is to.
@param url A url to view the email.
@since 2.1.0
@endsignaldef
@signaldef displaying-emails-notification
@signalproto
void (*displaying_emails_notification)(const char **subjects,
const char **froms,
const char **tos,
const char **urls,
guint count);
@endsignalproto
@signaldesc
Emitted before notification of multiple emails is handed to the UI to display.
@param subjects Subjects of emails being notified of.
@param froms Who the emails are from.
@param tos Who the emails are to.
@param urls The urls to view the emails.
@param count Number of emails being notified of.
@since 2.1.0
@endsignaldef
*/
// vim: syntax=c.doxygen tw=75 et