BREAK: move simplify_latex_rendering() to io module

src/ampform_dpd/__init__.py

@@ -23,6 +23,9 @@
     ThreeBodyDecayChain,
     get_decay_product_ids,
 )
+from ampform_dpd.io import (
+    simplify_latex_rendering,  # noqa: F401  # pyright:ignore[reportUnusedImport]
+)
 from ampform_dpd.spin import create_spin_range
 
 
@@ -386,17 +389,6 @@ def formulate_non_resonant(
     return sp.Rational(1), {}
 
 
-def simplify_latex_rendering() -> None:
-    """Improve LaTeX rendering of an `~sympy.tensor.indexed.Indexed` object."""
-
-    def _print_Indexed_latex(self, printer, *args):  # noqa: N802
-        base = printer._print(self.base)
-        indices = ", ".join(map(printer._print, self.indices))
-        return f"{base}_{{{indices}}}"
-
-    sp.Indexed._latex = _print_Indexed_latex
-
-
 def create_mass_symbol_mapping(decay: ThreeBodyDecay) -> dict[sp.Symbol, float]:
     return {
         sp.Symbol(f"m{i}"): decay.states[i].mass

src/ampform_dpd/io.py

@@ -378,3 +378,14 @@ def _warn_about_unsafe_hash():
     """
     message = dedent(message).replace("\n", " ").strip()
     _LOGGER.warning(message)
+
+
+def simplify_latex_rendering() -> None:
+    """Improve LaTeX rendering of an `~sympy.tensor.indexed.Indexed` object."""
+
+    def _print_Indexed_latex(self, printer, *args):  # noqa: N802
+        base = printer._print(self.base)
+        indices = ", ".join(map(printer._print, self.indices))
+        return f"{base}_{{{indices}}}"
+
+    sp.Indexed._latex = _print_Indexed_latex