Preserve UTF-8 when truncating input status

client_notification_test.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 	"testing"
 	"time"
+	"unicode/utf8"
 
 	"git.stormux.org/storm/barnard/gumble/gumble"
 )
@@ -57,6 +58,15 @@ func TestNotificationExpansionIsSinglePassAndNotifyDoesNotBlock(t *testing.T) {
 // and renderer resources. Cleanup must be safe for repeated disconnects.
 // Regression: user and channel names in the navigation tree bypassed message
 // escaping and could still carry terminal control characters.
+// Regression: status truncation used byte indexes and could create invalid
+// UTF-8 when a non-ASCII user or channel name exceeded the display limit.
+func TestTruncateInputStatusPreservesUTF8(t *testing.T) {
+	got := truncateInputStatus(strings.Repeat("é", 21))
+	if !utf8.ValidString(got) || utf8.RuneCountInString(got) != 21 {
+		t.Fatalf("invalid truncation %q", got)
+	}
+}
+
 func TestTreeItemSanitizesServerNames(t *testing.T) {
 	item := TreeItem{Channel: &gumble.Channel{Name: "\x1b[2Jroom"}}
 	if got := item.String(); got != "#[2Jroom" {