Add a timer between multiple-character actions, like "]]" "[[" "yy"

In the current implementation, two consecutive ']' clicks will always trigger "next page" action, no matter how long in between these two clicks. Even there is a one-minute gap, it will always redirect to the next page. However most of time when people use these multi-character actions, they will click twice within a second, and they don't want surprises, like click "y" twice change the clipboard without any visual clue.

It will be nice to add a timeout action to the state-machine, so these accidents will not happen. Thanks!

Start by locating the state-machine implementation that handles multi-character actions such as "]]", "[[", and "yy". Trace how consecutive keypresses are retained, then define completion as a timeout that prevents delayed second clicks from triggering the action while preserving quick multi-character actions.