diff --git a/IPython/core/inputtransformer2.py b/IPython/core/inputtransformer2.py
index 49bda87..9b8ef1a 100644
--- a/IPython/core/inputtransformer2.py
+++ b/IPython/core/inputtransformer2.py
@@ -427,7 +427,7 @@ class TransformerManager:
 
     def transform_cell(self, cell: str):
         if not cell.endswith('\n'):
-            cell += '\n'  # Ensure every line has a newline
+            cell += '\n'  # Ensure the cell has a trailing newline
         lines = cell.splitlines(keepends=True)
         for transform in self.cleanup_transforms + self.line_transforms:
             #print(transform, lines)
@@ -454,7 +454,7 @@ class TransformerManager:
           status is not 'incomplete', this is None.
         """
         if not cell.endswith('\n'):
-            cell += '\n'  # Ensure every line has a newline
+            cell += '\n'  # Ensure the cell has a trailing newline
         lines = cell.splitlines(keepends=True)
         if lines[-1][:-1].endswith('\\'):
             # Explicit backslash continuation
diff --git a/IPython/core/magics/execution.py b/IPython/core/magics/execution.py
index 0d036e1..7e0ad37 100644
--- a/IPython/core/magics/execution.py
+++ b/IPython/core/magics/execution.py
@@ -298,7 +298,7 @@ python-profiler package from non-free.""")
                                            list_all=True, posix=False)
         if cell is not None:
             arg_str += '\n' + cell
-        arg_str = self.shell.input_splitter.transform_cell(arg_str)
+        arg_str = self.shell.input_transformer_manager.transform_cell(arg_str)
         return self._run_with_profiler(arg_str, opts, self.shell.user_ns)
 
     def _run_with_profiler(self, code, opts, namespace):
@@ -1033,7 +1033,7 @@ python-profiler package from non-free.""")
         # this code has tight coupling to the inner workings of timeit.Timer,
         # but is there a better way to achieve that the code stmt has access
         # to the shell namespace?
-        transform  = self.shell.input_splitter.transform_cell
+        transform  = self.shell.input_transformer_manager.transform_cell
 
         if cell is None:
             # called as line magic
diff --git a/IPython/terminal/shortcuts.py b/IPython/terminal/shortcuts.py
index a96338d..b52c34e 100644
--- a/IPython/terminal/shortcuts.py
+++ b/IPython/terminal/shortcuts.py
@@ -77,7 +77,7 @@ def register_ipython_shortcuts(registry, shell):
 
     registry.add_binding(Keys.ControlO,
                          filter=(HasFocus(DEFAULT_BUFFER)
-                                & EmacsInsertMode()))(newline_autoindent_outer(shell.input_splitter))
+                                & EmacsInsertMode()))(newline_autoindent_outer(shell.input_transformer_manager))
 
     registry.add_binding(Keys.F2,
                          filter=HasFocus(DEFAULT_BUFFER)
@@ -119,7 +119,7 @@ def newline_or_execute_outer(shell):
             check_text = d.text
         else:
             check_text = d.text[:d.cursor_position]
-        status, indent = shell.input_splitter.check_complete(check_text + '\n')
+        status, indent = shell.input_transformer_manager.check_complete(check_text + '\n')
 
         if not (d.on_last_line or
                 d.cursor_position_row >= d.line_count - d.empty_line_count_at_the_end()
diff --git a/docs/source/config/details.rst b/docs/source/config/details.rst
index e1ce0f3..4785c32 100644
--- a/docs/source/config/details.rst
+++ b/docs/source/config/details.rst
@@ -282,7 +282,7 @@ IPython configuration::
             else: # insert a newline with auto-indentation...
 
                 if document.line_count > 1: text = text[:document.cursor_position]
-                indent = shell.input_splitter.check_complete(text + '\n')[1] or 0
+                indent = shell.input_transformer_manager.check_complete(text)[1] or 0
                 buffer.insert_text('\n' + ' ' * indent)
             
                 # if you just wanted a plain newline without any indentation, you