fix(tui): avoid doubled blank rows while streaming

codex-rs/tui/src/history_cell/messages.rs

@@ -423,15 +423,27 @@ impl HistoryCell for StreamingAgentTailCell {
     fn display_hyperlink_lines(&self, _width: u16) -> Vec<HyperlinkLine> {
         // Tail lines are already rendered at the controller's current stream width.
         // Re-wrapping them here can split table borders and produce malformed in-flight rows.
-        prefix_hyperlink_lines(
+        let mut lines = prefix_hyperlink_lines(
             self.lines.clone(),
             if self.is_first_line {
                 "• ".dim()
             } else {
                 "  ".into()
             },
             "  ".into(),
-        )
+        );
+        for line in &mut lines {
+            if line
+                .line
+                .spans
+                .iter()
+                .all(|span| span.content.chars().all(char::is_whitespace))
+            {
+                line.line = Line::default().style(line.line.style);
+                line.hyperlinks.clear();
+            }
+        }
+        lines
     }
 
     fn transcript_hyperlink_lines(&self, width: u16) -> Vec<HyperlinkLine> {

codex-rs/tui/src/history_cell/tests.rs

@@ -45,6 +45,24 @@ fn test_cwd() -> PathBuf {
     std::env::temp_dir()
 }
 
+#[test]
+fn streaming_agent_tail_blank_line_uses_one_viewport_row() {
+    let cell = StreamingAgentTailCell::new(
+        vec![
+            HyperlinkLine::from("first"),
+            HyperlinkLine::from(""),
+            HyperlinkLine::from("second"),
+        ],
+        /*is_first_line*/ false,
+    );
+
+    let lines = cell.display_lines(/*width*/ 80);
+    insta::assert_snapshot!(render_lines(&lines).join("\n"), @"  first
+
+  second");
+    assert_eq!(cell.desired_height(/*width*/ 80), 3);
+}
+
 fn stdio_server_config(
     command: &str,
     args: Vec<&str>,