Make BreakLine follow the cursor

src/InteractiveWindow/Editor/InteractiveWindow.cs

@@ -662,12 +662,7 @@ private void DeletePreviousCharacter()
 
             point.Value.Snapshot.TextBuffer.Delete(new Span(point.Value.Position - characterSize, characterSize));
 
-            UIThread(uiOnly =>
-            {
-                // scroll to the line being edited:
-                SnapshotPoint caretPosition = _textView.Caret.Position.BufferPosition;
-                _textView.ViewScroller.EnsureSpanVisible(new SnapshotSpan(caretPosition.Snapshot, caretPosition, 0));
-            });
+            UIThread(uiOnly => uiOnly.ScrollToCaret());
         }
 
         private void CutOrDeleteCurrentLine(bool isCut)
@@ -1049,6 +1044,7 @@ private bool HandlePostServicesReturn(bool trySubmit)
                 // insert new line (triggers secondary prompt injection in buffer changed event):
                 _currentLanguageBuffer.Insert(caretPosition, _lineBreakString);
                 IndentCurrentLine(_textView.Caret.Position.BufferPosition);
+                UIThread(uiOnly => uiOnly.ScrollToCaret());
 
                 return true;
             }

src/InteractiveWindow/Editor/InteractiveWindow_UIThread.cs

@@ -961,6 +961,14 @@ private void AddLanguageBuffer()
                 // projection buffer update must be the last operation as it might trigger event that accesses prompt line mapping:
                 _window.AppendProjectionSpans(promptSpan, languageSpan);
             }
+
+            public void ScrollToCaret()
+            {
+                var textView = _window._textView;
+                var caretPosition = textView.Caret.Position.BufferPosition;
+                var caretSpan = new SnapshotSpan(caretPosition.Snapshot, caretPosition, 0);
+                textView.ViewScroller.EnsureSpanVisible(caretSpan);
+            }
         }
 
         internal enum State