Paste the specified clipboard to the current pane.
This is only really meaningful on X11 and some Wayland systems that have multiple clipboards.
Possible values for source are:
Clipboard- paste from the system clipboard
PrimarySelection- paste from the primary selection buffer
Since: Version 20220319-142410-0fcdea07
The functionality described in this section requires version 20220319-142410-0fcdea07 of wezterm, or a more recent version.
PrimarySelection is now also supported on Wayland systems that support primary-selection-unstable-v1 or the older Gtk primary selection protocol.