Change DB stucture, improve LMC behaviour

**Please, backup your DB before performing any testing.**

Introduce new DB structure and DB migration mechanism.
Index `timestamp`, `to_jid`, `from_jid` columns to improve performance.
Add trigger for `replaced_by_db_id` calculation by DB on message insert.

Now LMC messages are interconnected with original messages,
this way we have fast access to last (hence correct) applicable edits,
as well as reference to the original message from any edit (in case of chained edits).

Change the way LMC messages are being displayed. Now we check if we
can replace a message from current buffer. If we don't have a message in
the buffer, it might've been lost, but we can still display it as a
new message.

Further information available here:
https://github.com/profanity-im/profanity/pull/1893
https://github.com/profanity-im/profanity/issues/1899
https://github.com/profanity-im/profanity/pull/1902

src/ui/chatwin.c

@@ -451,8 +451,8 @@ chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, char* id,
         win_print_outgoing((ProfWin*)chatwin, enc_char, id, replace_id, message);
     }
 
-    // save last id and message for LMC
-    if (id) {
+    // save last id and message for LMC in case if it's not LMC message
+    if (id && !replace_id) {
         _chatwin_set_last_message(chatwin, id, message);
     }
 }

src/ui/window.c

@@ -1335,19 +1335,27 @@ win_show_status_string(ProfWin* window, const char* const from,
     win_appendln(window, presence_colour, "");
 }
 
-static void
+/** Corrects the visual representation of a message with prior check for sender validity.
+ *
+ * Returns TRUE if the message was successfully corrected and should not be printed, FALSE otherwise.
+ */
+static gboolean
 _win_correct(ProfWin* window, const char* const message, const char* const id, const char* const replace_id, const char* const from_jid)
 {
+    if (!replace_id) {
+        return FALSE;
+    }
+
     ProfBuffEntry* entry = buffer_get_entry_by_id(window->layout->buffer, replace_id);
     if (!entry) {
-        log_debug("Replace ID %s could not be found in buffer. Message: %s", replace_id, message);
-        return;
+        log_warning("Replace ID %s could not be found in buffer. Message: %s", replace_id, message);
+        return FALSE;
     }
 
     if (g_strcmp0(entry->from_jid, from_jid) != 0) {
         log_debug("Illicit LMC attempt from %s for message from %s with: %s", from_jid, entry->from_jid, message);
         cons_show("Illicit LMC attempt from %s for message from %s", from_jid, entry->from_jid);
-        return;
+        return TRUE;
     }
 
     /*TODO: set date?
@@ -1369,12 +1377,10 @@ _win_correct(ProfWin* window, const char* const message, const char* const id, c
     }
     entry->message = strdup(message);
 
-    if (entry->id) {
-        free(entry->id);
-    }
-    entry->id = strdup(id);
+    // LMC requires original message ID, hence ID remains the same
 
     win_redraw(window);
+    return TRUE;
 }
 
 void
@@ -1406,9 +1412,7 @@ win_print_incoming(ProfWin* window, const char* const display_name_from, ProfMes
             enc_char = strdup("-");
         }
 
-        if (prefs_get_boolean(PREF_CORRECTION_ALLOW) && message->replace_id) {
-            _win_correct(window, message->plain, message->id, message->replace_id, message->from_jid->barejid);
-        } else {
+        if (!prefs_get_boolean(PREF_CORRECTION_ALLOW) || !_win_correct(window, message->plain, message->id, message->replace_id, message->from_jid->barejid)) {
             // Prevent duplicate messages when current client is sending a message or if it's mam
             if (g_strcmp0(message->from_jid->fulljid, connection_get_fulljid()) != 0 && !message->is_mam) {
                 _win_printf(window, enc_char, 0, message->timestamp, flags, THEME_TEXT_THEM, display_name_from, message->from_jid->barejid, message->id, "%s", message->plain);
@@ -1434,9 +1438,7 @@ win_print_them(ProfWin* window, theme_item_t theme_item, const char* const show_
 void
 win_println_incoming_muc_msg(ProfWin* window, char* show_char, int flags, const ProfMessage* const message)
 {
-    if (prefs_get_boolean(PREF_CORRECTION_ALLOW) && message->replace_id) {
-        _win_correct(window, message->plain, message->id, message->replace_id, message->from_jid->fulljid);
-    } else {
+    if (!prefs_get_boolean(PREF_CORRECTION_ALLOW) || !_win_correct(window, message->plain, message->id, message->replace_id, message->from_jid->fulljid)) {
         _win_printf(window, show_char, 0, message->timestamp, flags | NO_ME, THEME_TEXT_THEM, message->from_jid->resourcepart, message->from_jid->fulljid, message->id, "%s", message->plain);
     }
 
@@ -1448,9 +1450,7 @@ win_print_outgoing_muc_msg(ProfWin* window, char* show_char, const char* const m
 {
     GDateTime* timestamp = g_date_time_new_now_local();
 
-    if (prefs_get_boolean(PREF_CORRECTION_ALLOW) && replace_id) {
-        _win_correct(window, message, id, replace_id, me);
-    } else {
+    if (!prefs_get_boolean(PREF_CORRECTION_ALLOW) || !_win_correct(window, message, id, replace_id, me)) {
         _win_printf(window, show_char, 0, timestamp, 0, THEME_TEXT_ME, me, me, id, "%s", message);
     }
 
@@ -1464,9 +1464,7 @@ win_print_outgoing(ProfWin* window, const char* show_char, const char* const id,
     GDateTime* timestamp = g_date_time_new_now_local();
 
     const char* myjid = connection_get_fulljid();
-    if (replace_id) {
-        _win_correct(window, message, id, replace_id, myjid);
-    } else {
+    if (!_win_correct(window, message, id, replace_id, myjid)) {
         auto_gchar gchar* outgoing_str = prefs_get_string(PREF_OUTGOING_STAMP);
         _win_printf(window, show_char, 0, timestamp, 0, THEME_TEXT_ME, outgoing_str, myjid, id, "%s", message);
     }
@@ -1625,8 +1623,7 @@ win_print_outgoing_with_receipt(ProfWin* window, const char* show_char, const ch
     receipt->received = FALSE;
 
     const char* myjid = connection_get_fulljid();
-    if (replace_id) {
-        _win_correct(window, message, id, replace_id, myjid);
+    if (_win_correct(window, message, id, replace_id, myjid)) {
         free(receipt); // TODO: probably we should use this in _win_correct()
     } else {
         buffer_append(window->layout->buffer, show_char, 0, time, 0, THEME_TEXT_ME, from, myjid, message, receipt, id);