Hopefully make pty more similar to tested console behavior.

tests/unit/test_screen_manager_typing.py

@@ -1,3 +1,4 @@
+import time
 from unittest.mock import Mock
 
 import pytest
@@ -18,6 +19,7 @@ def _build_screen_manager(old_text, old_cursor):
             ),
             "CursorManager": Mock(is_application_window_set=Mock(return_value=False)),
             "DebugManager": Mock(write_debug_out=Mock()),
+            "InputManager": Mock(get_last_input_time=Mock(return_value=0)),
             "ScreenManager": manager,
             "SettingsManager": Mock(get_setting_as_bool=Mock(return_value=False)),
         },
@@ -61,3 +63,38 @@ def test_prompt_repaint_during_typing_keeps_only_typed_delta():
 
     assert env["screen"]["new_delta"] == "h"
     assert env["screen"]["new_delta_is_typing"] is True
+
+
+@pytest.mark.unit
+def test_tui_input_line_append_is_typing_delta():
+    manager, env = _build_screen_manager(
+        "\n".join(
+            [
+                    "<UserA> hi".ljust(20),
+                    "[Username] ".ljust(20),
+                ]
+            ),
+            {"x": 11, "y": 1},
+    )
+    env["runtime"]["InputManager"].get_last_input_time.return_value = time.time()
+
+    manager.update(
+        {
+            "bytes": b"",
+            "lines": 2,
+            "columns": 20,
+                "textCursor": {"x": 12, "y": 1},
+            "screen": "pty",
+            "text": "\n".join(
+                [
+                        "<UserA> hi".ljust(20),
+                    "[Username] l".ljust(20),
+                ]
+            ),
+            "attributes": [],
+        },
+        "onScreenUpdate",
+    )
+
+    assert env["screen"]["new_delta"] == "l"
+    assert env["screen"]["new_delta_is_typing"] is True