support long-pressing <esc> on Google Docs
support long-pressing <esc> on Google Docs

it use a hidden <iframe> (top: -10000px, width: 1px) to hold the caret,
but the editable element is <body>.firstElementChild,
which would prevent Vimium C to act on a repeated <esc> event

gdh1995/vimium-plus,gdh1995/vimium-plus,gdh1995/vimium-plus