remote: open file at line:column in existing or new nvim

[paul-hansen]

Request

I'd like to have an external program trigger opening neovim for a file at the given line and column, reusing any open instances of neovim or creating a new one.

Example integrations that would be benefit from this:
Godot
Unity3d
Wezterm

What I tried

Failed Attempt 1

Currently you can open a file in an existing instance or open a new instance with that file using:

nvim --server --remote-silent "/home/paul/test.txt" 

Problem: This does not support line numbers

Failed Attempt 2

Currently you can open a file at the given line:column in an existing nvim instance using:

nvim --listen ~/.cache/nvim/server.pipe
nvim --server --remote-send ":e /home/paul/test.txt|100G20|<CR>" 

Problem: This does nothing if there isn't an existing instance.

Expected behavior

Vim supported this with

vim --server --remote-silent +"normal 100G5|" "/home/paul/test.txt" 

So I expected that to work, but the [+{cmd]] part of --remote-silent is unimplemented in Neovim as mentioned by the documentation. I don't need it to be implemented the same way as Vim though.