In French, è is a single character issued by a single keypress on a French keyboard, like e, or +. (Note that A is shift+a). Why should it need two backspaces? If you press e+` well you have e`, not è.
I am assuming that means "on French keyboard", not "in French". I have a usa keyboard and live in Canada...Every now and then it thinks I'm typing French and keyboard indeed behaves in a way that some vowel plus some quotation mark indeed gives me some other character (that I don't need :)
That would feel very strange to me. The Canadian layout probably behaves differently, but à is a modifier letter, not two letters. I’d expect backspace to remove the whole letter, including the accent.
