1) in the text, add a new line through Enter
2) type a few letters
3) highlight something in the text and press ctrl+c
4) click at the end inserted in (2) letters
=> you can see that the text cursor "|" is not visible or visible but not blinking
if you click where else in the text, the cursor blinking at the new location, but if you click again in the end (2) - the cursor is now definitely not visible
it scares and irritating, especially on talk pages