Use PageUp and PageDown to search for previous GNOME Shell commands
Description
The GNOME Shell Run Command dialog (Alt-F2) and Looking Glass let you
cycle through the history of previous commands with the arrow keys, but
there's currently no built-in way to search or do autocompletion for
commands. With HistoryManager Prefix Search, you can type the beginning
of a command, and then hit the PageUp and PageDown keys to cycle through
previous commands which match the prefix you typed.
