[feature request] add field scratchpad_state to i3.Node

[slashfoo]

Currently the command i3-msg -t get_tree provides the field scratchpad_state that is useful in identifying windows that are currently shown but still considered to be in the scratchpad. This field is not present/unmarshalled into i3.Node.

I believe adding this line to the Node struct definition would suffice.

ScratchpadState    string           `json:"scratchpad_state"`

[stapelberg]

This package only implements what is documented (and hence stable) in the ipc docs, for the GET_TREE request specifically the reply is https://i3wm.org/docs/ipc.html#_tree_reply

Can you file an issue over at https://github.com/i3/i3/issues to get scratchpad_state documented first please?

[slashfoo]

I have filed a new feature request as requested. It can be found here: i3/i3#4465