Only handle "Select All" when Term has focus (identified by document.…

…activeElement).

Fixes vercel#6733.

lib/containers/hyper.tsx

@@ -36,7 +36,8 @@ const Hyper = forwardRef<HTMLDivElement, HyperProps>((props, ref) => {
 
  const handleSelectAll = () => {
  const term = terms.current?.getActiveTerm();
- if (term) {
+ const focus = document.activeElement?.classList.contains('xterm-helper-textarea');
+ if (term && focus) {
  term.selectAll();
  }
  };