fix: mascot animation, makes syntax highlighting blink

terminal_cursor.go

@@ -49,6 +49,21 @@ func (o *terminalCursorOutput) Write(value []byte) (int, error) {
 	o.mu.Lock()
 	defer o.mu.Unlock()
 
+	// Bubble Tea v1 can expose intermediate rows from an animated partial
+	// repaint. This is especially visible when unchanged Markdown code blocks
+	// below the changed rows contain dense ANSI styling. Terminals that support
+	// synchronized output hold the completed frame until the reset sequence;
+	// terminals that do not support it safely ignore both sequences.
+	if !bytes.Equal(value, []byte(ansi.ShowCursor)) &&
+		!bytes.Equal(value, []byte(ansi.HideCursor)) {
+		if _, err := io.WriteString(o.file, ansi.SetSynchronizedOutputMode); err != nil {
+			return 0, err
+		}
+		defer func() {
+			_, _ = io.WriteString(o.file, ansi.ResetSynchronizedOutputMode)
+		}()
+	}
+
 	written, err := o.file.Write(value)
 	if err != nil || written != len(value) {
 		return written, err