UICatalog Text Editor Column / Row not be updated when cursor moving

[qzhan16]

Describe the bug

Text Editor Column / Row not be updated when cursor moving

To Reproduce

1. Run the sample "UICatalog", select TextView -> Editor.
2. move the cursor by keyboard or mouse in the text editor, the column / row was not updated, unless i select some words or i do modification on the text.

Expected behavior
Column / Row should be updated when user move the cursor to provide a better user experience.

is any callback for cursor moving event to replace the UnwrappedCursorPosition?

[qzhan16]

Actually I found CurrentColumn / CurrentRow has been updated correctly in TextView, and UnwrappedCursorPosition was triggered as expected, but the UI just wasn't refreshed.

[qzhan16]

I worked around this by calling SetChildNeedsDisplay when UnwrappedCursorPosition event happen, looking for a more elegant solution.

_textView.UnwrappedCursorPosition += (e) => {
	siCursorPosition.Title = $"Ln {e.Y + 1}, Col {e.X + 1}";
+      Win.SetChildNeedsDisplay ();			
};