fix: japanese characters not truncated correctly in tui terminal output

1 files changed, 19 insertions, 0 deletions

diff --git a/app/tests/test_taskview.py b/app/tests/test_taskview.py
index 1db708d..78cc2f1 100644
--- a/app/tests/test_taskview.py
+++ b/app/tests/test_taskview.py
@@ -725,6 +725,25 @@ class LanesViewTests(_FakeTui, unittest.TestCase):
         pane_w = (screen.width - 3) // 2
         self.assertLessEqual(x + len(label) - 1, 1 + pane_w - 2)
 
+    def test_split_render_truncates_wide_log_lines_to_their_pane(self):
+        # Regression: Japanese characters fill two terminal cells each,
+        # so fitting by character count let transcription results spill
+        # out of the right pane onto the left one.
+        view, screen = self.make_view(self._two_lanes(), width=80)
+        view._ingest_lane_line(view._lanes[1],
+                               "[OK] 一号: " + "語" * 40)
+        view.render()
+        found = [(x, t) for _, x, t, _ in screen.strings
+                 if t.startswith("[OK] ")]
+        self.assertEqual(len(found), 1)
+        x, line = found[0]
+        self.assertTrue(line.endswith("~"))
+        pane_w = (screen.width - 3) // 2
+        px, pw = 1 + pane_w + 1, (screen.width - 3) - pane_w
+        self.assertGreaterEqual(x, px + 1)
+        self.assertLessEqual(x + taskview.tui._disp_width(line) - 1,
+                             px + pw - 2)
+
 
 class SilenceCueTests(_FakeTui, unittest.TestCase):
     """The "(no output 6m)" cue for a running step that stopped emitting."""