Summary:
I have a TextField txtf with txtf.selectAllOnFocus = txtf.selectAllOnMouseUp = false. 
When the user clicks into the text field, I want to know the cursor and selection indices, but I only get the previous indicies, not the ones after the click. 

Also refer to this slack discussion.]

Extra Notes:
Try something like this and observe the indices in the test output. Same is true for FocusEvent or MouseUpEvent.
{code:java}
var txtf = new TextField() { value = "Hello World!" };
txtf.selectAllOnFocus = txtf.selectAllOnMouseUp = false;

txtf.RegisterCallback<MouseDownEvent>(UpdateMenu);
void UpdateMenu(EventBase evt)
{
if (evt.target is not TextField txtf) return;
Debug.Log($"MouseDown on TextField: {txtf.cursorIndex}, {txtf.selectIndex}");
} {code}

I have no idea if this is a regression or not!

Expected Results:
I would expect some event that allow me to read to new indices based on the users click position.

Actual Results:
I only get the previous indices, i.e. the first one is always (0, 0), subsequent clicks yield the cursor position from before the click.

Tested on:
Unity Version 2021.1.4f1, Operating System WIN10.