Run the attached test. Press some text in the textbox in such a way that the text scrolls a few times. Now press CTRL + A to select all the text and paste some other text by pressing 'CTRL + V'. Now I expect the new text to appear there. But the textbox is empty and looks like the new text is pasted to the left, outside of the visible area. Pressing LEFT arrow now scrolls the text to visibility.

Ideally, when the whole text is replaced, the new text must be shown without which user will not know if he has pasted the text properly.