Cursor in edit field is not tracked in any way by Flickable This is causing it to hide any cursor that is in a TextEdit/TextArea as it is not possible to automatically adjust as a result. See cursor out of screen X11.mp4
The example attached has the solution in place to move the Flickable up when needed to show the cursor. To reproduce click inside TextArea editable 8 and then press enter and the cursor will end up out of the screen.
As potential solution would be adding a new property to TextEdit that would point onto Flickable, the TextEdit resides in. So, the Flickable would have its content coordinates updated to show the cursor on the screen.