fix(markdown): remove table double-header + add imgui_md bullet workaround

Table fix (src/markdown_table.py):
- Add TableColumnFlags_.width_stretch to each table_setup_column call
  (was missing — columns had no width to wrap against, so text_wrapped
  couldn't grow row height → all rows squished together)
- Remove the explicit for-h-in-headers: table_next_column + text_wrapped(h)
  loop. table_headers_row() already renders the header from the
  table_setup_column() names; the explicit loop was drawing it AGAIN on
  top → double-rendered header rows.

Bullet fix (src/markdown_helper.py):
- Revert _render_md_no_bullet_overlap → simple imgui_md.render(chunk);
  imgui.spacing() (the original af0bbe97 approach). The complex
  workaround was stripping '- ' and rendering stripped text to imgui_md,
  which double-rendered '- 1. ...' content (imgui.bullet from my code +
  numbered list marker from imgui_md).
- Add MarkdownRenderer._normalize_bullet_delimiters: regex-converts
  '* ' markers to '- ' before passing to imgui_md. This works around
  the upstream bug in mekhontsev/imgui_md BLOCK_LI where the '*' case
  calls ImGui::Bullet() without ImGui::SameLine(), causing the bullet
  to render on its own Y with the text on the next Y. The '-' case
  uses Text+SameLine which is correct. Cannot fix from Python (we
  can't subclass the C++ class) — pre-conversion is the cheapest fix.

Tests:
- test_markdown_table_wrapped.py: updated to assert new behavior
  (text_wrapped count == cell count, not header+cell).
- test_markdown_table_columns.py: updated to assert exactly 6
  table_next_column calls (cells only, not 9).
- test_markdown_helper_bullets.py: rewrote for new public-API behavior
  (imgui_md.render called with the unstripped chunk).

16/16 markdown unit tests pass.

src/markdown_helper.py

@@ -114,8 +114,8 @@ class MarkdownRenderer:
   """
   if not text:
    return
-
   from src.markdown_table import parse_tables, render_table
+  text = self._normalize_bullet_delimiters(text)
   blocks = parse_tables(text)
   lines = text.splitlines(keepends=True)
   if not lines:
@@ -134,7 +134,8 @@ class MarkdownRenderer:
    if md_buf:
     chunk = "".join(md_buf)
     if chunk:
-     self._render_md_no_bullet_overlap(chunk)
+     imgui_md.render(chunk)
+     imgui.spacing()
     md_buf.clear()
 
   def flush_code() -> None:
@@ -188,51 +189,19 @@ class MarkdownRenderer:
   flush_md()
   flush_code()
 
- def _render_md_no_bullet_overlap(self, chunk: str) -> None:
-  """Render markdown, but split out bulleted-list sections and render them
-  as plain text via imgui.text to avoid imgui_md's known bullet-overlap bug.
-  """
-  import re
-  list_pattern = re.compile(r"^(?P<indent>[ \t]*)(?:[-*+])\s+", re.MULTILINE)
-  current_pos = 0
-  for m in list_pattern.finditer(chunk):
-   if m.start() > current_pos:
-    pre = chunk[current_pos:m.start()]
-    if pre: imgui_md.render(pre)
-   list_start = m.start()
-   indent_len = len(m.group("indent"))
-   i = list_start
-   while i < len(chunk):
-    line_end = chunk.find("\n", i)
-    if line_end == -1: line_end = len(chunk)
-    line = chunk[i:line_end]
-    stripped = line.lstrip(" \t")
-    leading_ws = len(line) - len(stripped)
-    if leading_ws == indent_len and (stripped.startswith(("- ", "* ", "+ ")) or stripped == ""):
-     i = line_end + 1
-     continue
-    if leading_ws < indent_len:
-     break
-    i = line_end + 1
-   list_block = chunk[list_start:i]
-   for line in list_block.splitlines():
-    if not line.strip():
-     imgui.spacing()
-     continue
-    stripped = line.lstrip(" \t")
-    indent = len(line) - len(stripped)
-    if stripped.startswith(("- ", "* ", "+ ")):
-     imgui.bullet()
-     imgui.same_line()
-     imgui_md.render(stripped[2:])
-    else:
-     if indent > 0: imgui.indent(indent * 2)
-     imgui_md.render(stripped)
-     if indent > 0: imgui.unindent(indent * 2)
-   current_pos = i
-  if current_pos < len(chunk):
-   tail = chunk[current_pos:]
-   if tail: imgui_md.render(tail)
+ def _normalize_bullet_delimiters(self, text: str) -> str:
+   """Convert '*' list markers to '-' before passing to imgui_md.
+
+   Upstream imgui_md (mekhontsev/imgui_md) has a rendering bug in BLOCK_LI
+   for the '*' delimiter: it calls ImGui::Bullet() without ImGui::SameLine(),
+   causing the bullet to render on its own Y position with the text on the
+   next Y. The '-' delimiter uses Text+SameLine which works correctly.
+   Converting '* ' to '- ' is the cheapest workaround available from Python
+   (we cannot subclass the C++ imgui_md class).
+   [C: src/markdown_helper.py:MarkdownRenderer.render]
+   """
+   import re
+   return re.sub(r"(?m)^([ \t]*)\*[ \t]+", r"\1- ", text)
 
  def render_unindented(self, text: str) -> None:
   """Render Markdown text with automatic unindentation."""

src/markdown_table.py

@@ -13,11 +13,8 @@ def render_table(block: "TableBlock") -> None:
  flags = imgui.TableFlags_.borders | imgui.TableFlags_.row_bg | imgui.TableFlags_.resizable
  if not imgui.begin_table("md_table", n_cols, flags): return
  for h in block.headers:
-  imgui.table_setup_column(h)
+  imgui.table_setup_column(h, imgui.TableColumnFlags_.width_stretch)
  imgui.table_headers_row()
- for h in block.headers:
-  imgui.table_next_column()
-  imgui.text_wrapped(h)
  for row in block.rows:
   imgui.table_next_row()
   for c in row:

tests/test_markdown_helper_bullets.py

@@ -1,54 +1,59 @@
 from unittest.mock import patch, MagicMock
 from src.markdown_helper import MarkdownRenderer
 
-def test_bullet_list_renders_each_item_with_imgui_bullet():
- chunk = "- one\n- two\n- three\n"
- with patch("src.markdown_helper.imgui") as mock_imgui, patch("src.markdown_helper.imgui_md") as mock_md:
-  mock_imgui.bullet = MagicMock()
-  mock_imgui.same_line = MagicMock()
-  mock_imgui.spacing = MagicMock()
-  mock_imgui.indent = MagicMock()
-  mock_imgui.unindent = MagicMock()
-  mock_md.render = MagicMock()
-  MarkdownRenderer()._render_md_no_bullet_overlap(chunk)
-  assert mock_imgui.bullet.call_count >= 3
-  assert mock_imgui.same_line.call_count >= 3
-  assert mock_md.render.call_count >= 3
+def _mock_table(mock_imgui):
+ mock_imgui.TableFlags_ = type("T", (), {"borders": 1, "row_bg": 2, "resizable": 4})()
+ mock_imgui.TableColumnFlags_ = type("C", (), {"width_stretch": 8})()
+ mock_imgui.begin_table.return_value = True
+ mock_imgui.table_next_column = lambda: None
+ mock_imgui.table_next_row = lambda: None
+ mock_imgui.table_headers_row = lambda: None
+ mock_imgui.text = lambda *a, **k: None
+ mock_imgui.text_wrapped = lambda *a, **k: None
+ mock_imgui.end_table = lambda: None
+ mock_imgui.same_line = lambda: None
+ mock_imgui.spacing = lambda: None
+ mock_imgui.indent = lambda *a: None
+ mock_imgui.unindent = lambda *a: None
 
-def test_bullet_list_with_blank_lines_uses_spacing():
- chunk = "- one\n\n- two\n"
- with patch("src.markdown_helper.imgui") as mock_imgui, patch("src.markdown_helper.imgui_md") as mock_md:
-  mock_imgui.bullet = MagicMock()
-  mock_imgui.same_line = MagicMock()
-  mock_imgui.spacing = MagicMock()
-  mock_imgui.indent = MagicMock()
-  mock_imgui.unindent = MagicMock()
+def test_render_calls_imgui_md_render_for_bullet_chunks():
+ md = "- one\n- two\n- three\n"
+ with patch("src.markdown_helper.imgui_md") as mock_md, \
+      patch("src.markdown_helper.imgui") as mock_imgui, \
+      patch("src.markdown_table.imgui") as mock_table_imgui:
+  _mock_table(mock_table_imgui)
   mock_md.render = MagicMock()
-  MarkdownRenderer()._render_md_no_bullet_overlap(chunk)
-  assert mock_imgui.spacing.call_count >= 1
+  mock_imgui.spacing = MagicMock()
+  MarkdownRenderer().render(md, context_id="bullets")
+  assert mock_md.render.call_count == 1, f"expected 1 imgui_md.render call (full chunk passed through), got {mock_md.render.call_count}"
+  assert mock_imgui.spacing.call_count >= 1, "imgui.spacing must be called to force vertical gap between chunks"
 
-def test_non_bullet_markdown_routes_to_imgui_md():
- chunk = "# Header\n\nSome prose."
- with patch("src.markdown_helper.imgui") as mock_imgui, patch("src.markdown_helper.imgui_md") as mock_md:
-  mock_imgui.bullet = MagicMock()
-  mock_imgui.same_line = MagicMock()
-  mock_imgui.spacing = MagicMock()
-  mock_imgui.indent = MagicMock()
-  mock_imgui.unindent = MagicMock()
+def test_render_does_not_strip_bullet_prefix_from_markdown():
+ md = "- one\n- two\n"
+ with patch("src.markdown_helper.imgui_md") as mock_md, \
+      patch("src.markdown_helper.imgui") as mock_imgui, \
+      patch("src.markdown_table.imgui") as mock_table_imgui:
+  _mock_table(mock_table_imgui)
   mock_md.render = MagicMock()
-  MarkdownRenderer()._render_md_no_bullet_overlap(chunk)
-  assert not mock_imgui.bullet.called
+  mock_imgui.spacing = MagicMock()
+  MarkdownRenderer().render(md, context_id="bullets")
+  args, _ = mock_md.render.call_args
+  rendered_text = args[0]
+  assert "- one" in rendered_text, f"bullet prefix must NOT be stripped (regression: was double-rendering as bullet + imgui_md numbered list), got {rendered_text!r}"
+  assert "- two" in rendered_text
+
+def test_render_passes_numbered_list_intact_to_imgui_md():
+ md = "1. First question\n2. Second question\n"
+ with patch("src.markdown_helper.imgui_md") as mock_md, \
+      patch("src.markdown_helper.imgui") as mock_imgui, \
+      patch("src.markdown_table.imgui") as mock_table_imgui:
+  _mock_table(mock_table_imgui)
+  mock_md.render = MagicMock()
+  mock_imgui.spacing = MagicMock()
+  MarkdownRenderer().render(md, context_id="numbered")
   assert mock_md.render.call_count == 1
-
-def test_mixed_bullets_and_prose_splits_correctly():
- chunk = "Prose before.\n\n- b1\n- b2\n\nProse after."
- with patch("src.markdown_helper.imgui") as mock_imgui, patch("src.markdown_helper.imgui_md") as mock_md:
-  mock_imgui.bullet = MagicMock()
-  mock_imgui.same_line = MagicMock()
-  mock_imgui.spacing = MagicMock()
-  mock_imgui.indent = MagicMock()
-  mock_imgui.unindent = MagicMock()
-  mock_md.render = MagicMock()
-  MarkdownRenderer()._render_md_no_bullet_overlap(chunk)
-  assert mock_imgui.bullet.call_count >= 2
-  assert mock_md.render.call_count >= 2
+  args, _ = mock_md.render.call_args
+  rendered_text = args[0]
+  assert "1. First question" in rendered_text
+  assert "2. Second question" in rendered_text
+  assert not mock_imgui.bullet.called, "no manual imgui.bullet should be added — let imgui_md handle list rendering"

tests/test_markdown_table_columns.py

@@ -9,4 +9,5 @@ def test_render_table_sets_up_columns_before_rows():
   mock_imgui.begin_table.return_value = True
   render_table(block)
   assert mock_imgui.table_setup_column.call_count == 3, f"expected 3 table_setup_column calls (one per column), got {mock_imgui.table_setup_column.call_count}"
-  assert mock_imgui.table_next_column.call_count >= 9, f"expected at least 9 table_next_column calls (3 headers + 6 cells), got {mock_imgui.table_next_column.call_count}"
+  assert mock_imgui.table_next_column.call_count == 6, f"expected exactly 6 table_next_column calls (cells only — headers come from table_headers_row, not from an explicit loop), got {mock_imgui.table_next_column.call_count}"
+  assert mock_imgui.table_next_row.call_count == 2, f"expected 2 table_next_row calls (one per data row, not counting the header row), got {mock_imgui.table_next_row.call_count}"

tests/test_markdown_table_wrapped.py

@@ -1,44 +1,57 @@
 from unittest.mock import patch, MagicMock
 from src.markdown_table import render_table, TableBlock
 
+def _setup_mocks(mock_imgui):
+ mock_imgui.TableFlags_ = type("T", (), {"borders": 1, "row_bg": 2, "resizable": 4})()
+ mock_imgui.TableColumnFlags_ = type("C", (), {"width_stretch": 8, "width_fixed": 16})()
+ mock_imgui.begin_table.return_value = True
+ mock_imgui.table_next_column = MagicMock()
+ mock_imgui.table_next_row = MagicMock()
+ mock_imgui.table_headers_row = MagicMock()
+ mock_imgui.text_wrapped = MagicMock()
+ mock_imgui.text = MagicMock()
+ mock_imgui.end_table = MagicMock()
+
 def test_render_table_uses_text_wrapped_for_cells():
  block = TableBlock(headers=["A"], rows=[["hello"]], span=(0, 2))
  with patch("src.markdown_table.imgui") as mock_imgui:
-  mock_imgui.TableFlags_ = type("T", (), {"borders": 1, "row_bg": 2, "resizable": 4})()
-  mock_imgui.begin_table.return_value = True
-  mock_imgui.table_next_column = MagicMock()
-  mock_imgui.table_next_row = MagicMock()
-  mock_imgui.table_headers_row = MagicMock()
-  mock_imgui.text_wrapped = MagicMock()
-  mock_imgui.text = MagicMock()
-  mock_imgui.end_table = MagicMock()
+  _setup_mocks(mock_imgui)
   render_table(block)
   mock_imgui.text_wrapped.assert_any_call("hello")
 
-def test_render_table_uses_text_wrapped_for_headers():
+def test_render_table_uses_table_headers_row_for_headers():
  block = TableBlock(headers=["A"], rows=[["hello"]], span=(0, 2))
  with patch("src.markdown_table.imgui") as mock_imgui:
-  mock_imgui.TableFlags_ = type("T", (), {"borders": 1, "row_bg": 2, "resizable": 4})()
-  mock_imgui.begin_table.return_value = True
-  mock_imgui.table_next_column = MagicMock()
-  mock_imgui.table_next_row = MagicMock()
-  mock_imgui.table_headers_row = MagicMock()
-  mock_imgui.text_wrapped = MagicMock()
-  mock_imgui.text = MagicMock()
-  mock_imgui.end_table = MagicMock()
+  _setup_mocks(mock_imgui)
   render_table(block)
-  mock_imgui.text_wrapped.assert_any_call("A")
+  assert mock_imgui.table_headers_row.called, "table_headers_row must be called exactly once to render the header row"
+  assert mock_imgui.table_headers_row.call_count == 1, f"table_headers_row must be called exactly once (not {mock_imgui.table_headers_row.call_count} — would cause double-header bug)"
 
 def test_render_table_does_not_use_text_for_cells():
  block = TableBlock(headers=["A"], rows=[["hello"]], span=(0, 2))
  with patch("src.markdown_table.imgui") as mock_imgui:
-  mock_imgui.TableFlags_ = type("T", (), {"borders": 1, "row_bg": 2, "resizable": 4})()
-  mock_imgui.begin_table.return_value = True
-  mock_imgui.table_next_column = MagicMock()
-  mock_imgui.table_next_row = MagicMock()
-  mock_imgui.table_headers_row = MagicMock()
-  mock_imgui.text_wrapped = MagicMock()
-  mock_imgui.text = MagicMock()
-  mock_imgui.end_table = MagicMock()
+  _setup_mocks(mock_imgui)
   render_table(block)
-  assert not mock_imgui.text.called, "imgui.text should not be called for table cells"
+  assert not mock_imgui.text.called, "imgui.text should not be called for table cells"
+
+def test_render_table_uses_width_stretch_for_columns():
+ block = TableBlock(headers=["A", "B"], rows=[["1", "2"]], span=(0, 3))
+ with patch("src.markdown_table.imgui") as mock_imgui:
+  _setup_mocks(mock_imgui)
+  render_table(block)
+  assert mock_imgui.table_setup_column.call_count == 2
+  for call in mock_imgui.table_setup_column.call_args_list:
+   args, _ = call
+   assert imgui_flags_passed(args), f"table_setup_column must include width_stretch flag, got args={args}"
+
+def imgui_flags_passed(args) -> bool:
+ if len(args) < 2: return False
+ return bool(args[1] & 8)
+
+def test_render_table_text_wrapped_count_matches_cell_count():
+ block = TableBlock(headers=["A", "B"], rows=[["1", "2"], ["3", "4"], ["5", "6"]], span=(0, 5))
+ with patch("src.markdown_table.imgui") as mock_imgui:
+  _setup_mocks(mock_imgui)
+  render_table(block)
+  cell_count = 6
+  assert mock_imgui.text_wrapped.call_count == cell_count, f"text_wrapped must be called exactly {cell_count} times (cells only, not headers), got {mock_imgui.text_wrapped.call_count}"