fix(chatwin): Fix LMC autocompletion to suggest corrected message content

- Modified chatwin_outgoing_msg to call _chatwin_set_last_message for corrected messages, using replace_id per XEP-0308.
- Updated _chatwin_set_last_message to skip redundant and invalid free/strdup for same pointers.
- Added null checks in _chatwin_set_last_message for safety.
- Fixes autocompletion suggesting original message content instead of corrected content.

Fixes #24

src/ui/chatwin.c

@@ -424,9 +424,11 @@ chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, const char
         win_print_outgoing((ProfWin*)chatwin, enc_char, id, replace_id, display_message);
     }
 
-    // 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, display_message);
+    // Save last id and message for LMC
+    // Note: if the same message is to be corrected several times, the id of the original message is used in each case
+    // https://xmpp.org/extensions/xep-0308.html#rules
+    if (id) {
+        _chatwin_set_last_message(chatwin, replace_id ?: id, display_message);
     }
 }
 
@@ -625,9 +627,13 @@ chatwin_db_history(ProfChatWin* chatwin, const gchar* start_time, const gchar* e
 static void
 _chatwin_set_last_message(ProfChatWin* chatwin, const char* const id, const char* const message)
 {
-    free(chatwin->last_message);
-    chatwin->last_message = strdup(message);
+    if (message && chatwin->last_message != message) {
+        free(chatwin->last_message);
+        chatwin->last_message = strdup(message);
+    }
 
-    free(chatwin->last_msg_id);
-    chatwin->last_msg_id = strdup(id);
+    if (id && chatwin->last_msg_id != id) {
+        free(chatwin->last_msg_id);
+        chatwin->last_msg_id = strdup(id);
+    }
 }

tests/functionaltests/test_message.c

@@ -27,6 +27,9 @@ message_send(void **state)
     assert_true(prof_output_regex("me: .+Hi there"));
 }
 
+// TODO: `/message correct` XEP-0308 compliance (whether each correction links to the original message ID)
+// https://xmpp.org/extensions/xep-0308.html#rules
+
 void
 message_receive_console(void **state)
 {