Error parsing watch later files

Important Information

Provide following Information:

• mpv 67aa568
• Platform and Version
• Source of the mpv binary

Reproduction steps

1. use this script

mp.msg = require("mp.msg")
mp.utils = require("mp.utils")
mp.add_hook("on_preloaded", 50, function()
	local stream_opts = mp.get_property_native("file-local-options/stream-lavf-o")
	mp.msg.warn(mp.utils.to_string(stream_opts))
	stream_opts["cookies"] = "test1=123; path=/; domain=.example.com;\r\ntest2=aaa; path=/; domain=.example.com;\r\n"
	mp.set_property_native("file-local-options/stream-lavf-o", stream_opts)
end)

2. mpv --save-position-on-quit --watch-later-options-append=stream-lavf-o <FILE>
3. quit mpv
4. reopen file on Step 2

Expected behavior

no errors

Actual behavior

watch_later/<MD5>:3: fixed-length quoting expected - put "quotes" around the option value if you did not intend to use this, but your option value starts with '%'
Error parsing option test2 (option not found)
watch_later/<MD5>:4: setting option test2='aaa; path=/; domain=.example.com;' failed.

Reproduce the issue with the supplied Lua script and the mpv command, then inspect the generated watch_later/ file and the reported option-parsing errors. Trace the watch-later loading path from that file. Done means reopening the file produces no parsing or option-setting errors for the saved stream-lavf-o cookies.