fix(history): address PR #116 review feedback

- console: drop orphaned `Chat logging (/logging chat)` lines from
  cons_logging_setting() and cons_privacy_setting() — the /logging chat
  subcommand was removed, PREF_CHLOG now tracks PREF_HISTORY implicitly
- command: deprecate /logging command. It now prints a single notice
  pointing to /history; CMD_PREAMBLE trimmed (min_args=0, no
  setting_func, syntax/args/examples dropped); subcommand 'group'
  removed from autocomplete
- sqlite: gate LMC merge in _sqlite_get_previous_chat() on
  PREF_CORRECTION_ALLOW. When /correction is off, return original and
  correction rows as separate messages instead of merging via
  COALESCE/LEFT JOIN — matches the flatfile load path and the PR's
  stated semantics for /correction off

src/database_sqlite.c

@@ -384,16 +384,29 @@ _sqlite_get_previous_chat(const gchar* const contact_barejid, const gchar* start
     const gchar* sort2 = !flip ? "ASC" : "DESC";
     GDateTime* now = g_date_time_new_now_local();
     auto_gchar gchar* end_date_fmt = end_time ? g_strdup(end_time) : g_date_time_format_iso8601(now);
+
+    // When LMC is disabled, return original and correction rows as separate
+    // messages instead of merging the correction text into the original.
+    // Otherwise the user sees corrected text in history even with
+    // /correction off.
+    const gboolean lmc_allowed = prefs_get_boolean(PREF_CORRECTION_ALLOW);
+    const char* msg_expr = lmc_allowed ? "COALESCE(B.`message`, A.`message`)" : "A.`message`";
+    const char* join_clause = lmc_allowed
+                                  ? "LEFT JOIN `ChatLogs` AS B ON (A.`replaced_by_db_id` = B.`id` AND A.`from_jid` = B.`from_jid`) "
+                                  : "";
+    const char* replaces_filter = lmc_allowed ? "(A.`replaces_db_id` IS NULL) AND " : "";
+
     auto_sqlite gchar* query = sqlite3_mprintf("SELECT * FROM ("
-                                               "SELECT COALESCE(B.`message`, A.`message`) AS message, "
+                                               "SELECT %s AS message, "
                                                "A.`timestamp`, A.`from_jid`, A.`from_resource`, A.`to_jid`, A.`to_resource`, A.`type`, A.`encryption`, A.`stanza_id` FROM `ChatLogs` AS A "
-                                               "LEFT JOIN `ChatLogs` AS B ON (A.`replaced_by_db_id` = B.`id` AND A.`from_jid` = B.`from_jid`) "
-                                               "WHERE (A.`replaces_db_id` IS NULL) "
-                                               "AND ((A.`from_jid` = %Q AND A.`to_jid` = %Q) OR (A.`from_jid` = %Q AND A.`to_jid` = %Q)) "
+                                               "%s"
+                                               "WHERE %s"
+                                               "((A.`from_jid` = %Q AND A.`to_jid` = %Q) OR (A.`from_jid` = %Q AND A.`to_jid` = %Q)) "
                                                "AND A.`timestamp` < %Q "
                                                "AND (%Q IS NULL OR A.`timestamp` > %Q) "
                                                "ORDER BY A.`timestamp` %s LIMIT %d) "
                                                "ORDER BY `timestamp` %s;",
+                                               msg_expr, join_clause, replaces_filter,
                                                contact_barejid, myjid->barejid, myjid->barejid, contact_barejid, end_date_fmt, start_time, start_time, sort1, MESSAGES_TO_RETRIEVE, sort2);
 
     g_date_time_unref(now);