Suppose that I have a 5 kbyte comment with multiple paragraphs, and I skip around copy and pasting from one place to another, and highlight some sentences and over write them either with typing or pasting. When I go to undo or redo some of these things, it causes a big screw-up in the text.

Other than it being my problem to recompose the damaged sentences, etc, what developers need to be contacted to fix the undo and redo functions of the YouTube comment input text controls for YouTube videos?