sokoban.love/0067-paste_button

paste_button = function(x, y, r)
	return overflowable_button('paste', x, y, r,
		function()
			Show_menu = nil
			local state = Current_pane.editor_state
			-- initial state for recording undo operation
			local before_line = state.cursor1.line
			local before = snapshot(state, before_line)
			-- paste
			local s = App.get_clipboard()
			Text.insert_text(state, s)
			-- record undo operation
			record_undo_event(state,
				{
					before=before,
					after=snapshot(
						state, before_line,
						state.cursor1.line)
				})
		end)
end