Only show QUIT/NICK in channels where user was present, suppress English echo

- QUIT messages only appear in channels where the user was in nick list
- NICK changes only shown in channels where user is present
- Suppress translation when English result matches original (50%+ word overlap)

main.c

@@ -619,9 +619,9 @@ static void nicklist_add(int idx, const char *n)
 		         NICK_LEN, "%s", n);
 }
 
-static void nicklist_remove(int idx, const char *n)
+static int nicklist_remove(int idx, const char *n)
 {
-	if (idx < 0 || idx >= MAX_CHAN_WINS) return;
+	if (idx < 0 || idx >= MAX_CHAN_WINS) return 0;
 	for (int i = 0; i < win_chans[idx].nick_count; i++) {
 		if (strcasecmp(win_chans[idx].nicks[i], n) == 0) {
 			win_chans[idx].nick_count--;
@@ -629,21 +629,10 @@ static void nicklist_remove(int idx, const char *n)
 				memcpy(win_chans[idx].nicks[i],
 				       win_chans[idx].nicks[win_chans[idx].nick_count],
 				       NICK_LEN);
-			return;
+			return 1;
-		}
-	}
-}
-
-static void nicklist_rename(const char *old, const char *new_nick)
-{
-	for (int i = 0; i < MAX_CHAN_WINS; i++) {
-		for (int j = 0; j < win_chans[i].nick_count; j++) {
-			if (strcasecmp(win_chans[i].nicks[j], old) == 0) {
-				snprintf(win_chans[i].nicks[j], NICK_LEN, "%s", new_nick);
-				break;
-			}
 		}
 	}
+	return 0;
 }
 
 static int chan_win_idx(const char *chan)
@@ -926,10 +915,10 @@ static void handle_line(char *line)
 	} else if (strcmp(cmd, "QUIT") == 0) {
 		char *reason = params;
 		if (reason && reason[0] == ':') reason++;
-		/* Show quit in all active channel windows and remove nick */
+		/* Show quit only in channels where the user was present */
 		for (int i = 0; i < MAX_CHAN_WINS; i++) {
 			if (win_chans[i].name[0]) {
-				nicklist_remove(i, sender);
+				if (nicklist_remove(i, sender))
 					wprintf(WL_CHAN + i, "\033[1m* %s has quit (%s)\033[0m\n",
 					        sender, reason ? reason : "");
 			}
@@ -937,13 +926,23 @@ static void handle_line(char *line)
 	} else if (strcmp(cmd, "NICK") == 0) {
 		char *newnick = params;
 		if (newnick && newnick[0] == ':') newnick++;
-		/* Update nick lists and show in all active channel windows */
+		/* Update nick lists and show only in channels where user is present */
-		if (newnick) nicklist_rename(sender, newnick);
 		for (int i = 0; i < MAX_CHAN_WINS; i++) {
-			if (win_chans[i].name[0])
+			if (win_chans[i].name[0]) {
+				int found = 0;
+				for (int j = 0; j < win_chans[i].nick_count; j++) {
+					if (strcasecmp(win_chans[i].nicks[j], sender) == 0) {
+						if (newnick)
+							snprintf(win_chans[i].nicks[j], NICK_LEN, "%s", newnick);
+						found = 1;
+						break;
+					}
+				}
+				if (found)
 					wprintf(WL_CHAN + i, "* %s is now known as %s\n",
 					        sender, newnick ? newnick : "");
 			}
+		}
 		if (strcasecmp(sender, nick) == 0 && newnick) {
 			snprintf(nick, sizeof(nick), "%s", newnick);
 			draw_statusbar();
@@ -1578,6 +1577,31 @@ int main(int argc, char *argv[])
 					    strncasecmp(english, "SKIP", 4) == 0)
 						suppress = 1;
 
+					/* Suppress if English translation matches original */
+					if (!suppress && translate_pending[ti].original[0]) {
+						char orig_l[512], eng_l[1024];
+						snprintf(orig_l, sizeof(orig_l), "%s",
+						         translate_pending[ti].original);
+						snprintf(eng_l, sizeof(eng_l), "%s", english);
+						for (char *p = orig_l; *p; p++)
+							if (*p >= 'A' && *p <= 'Z') *p += 32;
+						for (char *p = eng_l; *p; p++)
+							if (*p >= 'A' && *p <= 'Z') *p += 32;
+						int total = 0, matches = 0;
+						char orig_copy[512];
+						snprintf(orig_copy, sizeof(orig_copy), "%s", orig_l);
+						char *tok = strtok(orig_copy, " ,.!?:;");
+						while (tok) {
+							if (strlen(tok) > 2) {
+								total++;
+								if (strstr(eng_l, tok)) matches++;
+							}
+							tok = strtok(NULL, " ,.!?:;");
+						}
+						if (total > 0 && matches * 100 / total >= 50)
+							suppress = 1;
+					}
+
 					if (!suppress && english[0]) {
 						/* Strip trailing whitespace from english */
 						size_t elen = strlen(english);