BUG: Styler.to_latex with multirow cellcolor (#43720)

Author: attack68

pandas/io/formats/style_render.py

@@ -740,7 +740,7 @@ def _translate_latex(self, d: dict) -> None:
                         "display_value": col["display_value"]
                         if col["is_visible"]
                         else "",
-                        "cellstyle": self.ctx_index[r, c] if col["is_visible"] else [],
+                        "cellstyle": self.ctx_index[r, c],
                     }
                     for c, col in enumerate(row[:index_levels])
                     if (col["type"] == "th" and not self.hide_index_[c])

pandas/tests/io/formats/style/test_to_latex.py

@@ -753,7 +753,7 @@ def test_apply_map_header_render_mi(df_ext, index, columns, siunitx):
     expected_index = dedent(
         """\
     \\multirow[c]{2}{*}{\\bfseries{A}} & a & 0 & -0.610000 & ab \\\\
-     & b & 1 & -1.220000 & cd \\\\
+    \\bfseries{} & b & 1 & -1.220000 & cd \\\\
     B & \\bfseries{c} & 2 & -2.220000 & de \\\\
     """
     )
@@ -840,7 +840,7 @@ def test_latex_hiding_index_columns_multiindex_alignment():
         i-0 & i-2 &  &  &  \\\\
         i0 & \\color{blue} j2 & \\color{red} 5 & 6 & 7 \\\\
         \\multirow[c]{2}{*}{\\color{blue} j0} & i2 & 9 & 10 & 11 \\\\
-         & \\color{blue} j2 & 13 & 14 & 15 \\\\
+        \\color{blue}  & \\color{blue} j2 & 13 & 14 & 15 \\\\
         \\end{tabular}
         """
     )