Clears the lines that have scrolled off the top of the viewport, resetting the scrollbar thumb to the full height of the window.

since: 20210203-095643-70a364eb

Added a parameter that allows additionally clear the viewport:

local wezterm = require 'wezterm'
local act = wezterm.action

return {
  keys = {
    -- Clears only the scrollback and leaves the viewport intact.
    -- This is the default behavior.
    {key="K", mods="CTRL|SHIFT", action=act.ClearScrollback("ScrollbackOnly")},
    -- Clears the scrollback and viewport leaving the prompt line the new first line.
    {key="K", mods="CTRL|SHIFT", action=act.ClearScrollback("ScrollbackAndViewport")},