Switch Pidgin's default username for Jabber chats from the Jabber username to the account's local alias.

pidgin-chatroom-default-alias.patch

diff -r 1d3a0e42cb09 libpurple/protocols/jabber/chat.c
--- a/libpurple/protocols/jabber/chat.c	Mon Nov 25 16:51:46 2013 +0100
+++ b/libpurple/protocols/jabber/chat.c	Wed Nov 27 01:39:56 2013 -0800
@@ -74,7 +74,8 @@
 
 	defaults = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_free);
 
-	g_hash_table_insert(defaults, "handle", g_strdup(js->user->node));
+	const char *alias = purple_account_get_alias(purple_connection_get_account(gc));
+	g_hash_table_insert(defaults, "handle", g_strdup(alias ? alias : js->user->node));
 
 	if (js->chat_servers)
 		g_hash_table_insert(defaults, "server", g_strdup(js->chat_servers->data));