Vdebug calculates source window incorrectly in Neovim

When using neovim and trying to debug something that’s further away from the first windows, it breaks the layout, or even throws an exception. Here I had 6 tabs opened and 7th was my source file with breakpoint: Vim:

- [Info] {Sat 07 2017 12:58:28} Searching for win by name /home/vagrant/test.php
- [Info] {Sat 07 2017 12:58:28} Win 1, name /home/vagrant/test.php
- [Info] {Sat 07 2017 12:58:28} Returning window number 1
- [Info] {Sat 07 2017 12:58:28} Found window 1, activating
- [Info] {Sat 07 2017 12:58:28} Found connection from ('127.0.0.1', 37240)
....

Neovim:

- [Info] {Sat 07 2017 12:52:22} Searching for win by name /home/vagrant/test.php
- [Info] {Sat 07 2017 12:52:22} Win 1, name 
- [Info] {Sat 07 2017 12:52:22} Win 2, name 
- [Info] {Sat 07 2017 12:52:22} Win 3, name 
- [Info] {Sat 07 2017 12:52:22} Win 4, name 
- [Info] {Sat 07 2017 12:52:22} Win 5, name 
- [Info] {Sat 07 2017 12:52:22} Win 6, name 
- [Info] {Sat 07 2017 12:52:22} Win 7, name /home/vagrant/test.php
- [Info] {Sat 07 2017 12:52:22} Returning window number 7
- [Info] {Sat 07 2017 12:52:22} Found window 7, activating
- [Info] {Sat 07 2017 12:52:22} Closing the connection
- [Debug] {Sat 07 2017 12:52:22} Command: stop -i 1
- [Debug] {Sat 07 2017 12:52:22} Response: <?xml version="1.0" encoding="iso-8859-1"?>
<response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="stop" transaction_id="1" status="stopped" reason="ok"></response>
- [Debug] {Sat 07 2017 12:52:22} Closing the socket
- [ERROR] {Sat 07 2017 12:52:22} An error occured: <class 'neovim.api.nvim.NvimError'>
Traceback (most recent call last):
  File "/home/vagrant/.vim/bundle/vdebug/plugin/python/start_vdebug.py", line 31, in run
    self.runner.run()
  File "/home/vagrant/.vim/vdebug/plugin/python/vdebug/runner.py", line 184, in run
    self.open()
  File "/home/vagrant/.vim/vdebug/plugin/python/vdebug/runner.py", line 48, in open
    self.ui.open()
  File "/home/vagrant/.vim/vdebug/plugin/python/vdebug/ui/vimui.py", line 80, in open
    raise e
NvimError: Vim(wincmd):E16: Invalid range

It seems that vim-python manages windows differently in vim and neovim. In vim it is managed by-tab, in neovim it is managed globally

vim -c "vsplit" -c "tabnew" -c "py import vim"

:py print len(vim.windows)

Vim outputs 1 Neovim outputs 3

I hacked some sort of a PR, maybe you have more sophisticated idea what is going on and how to fix better.

[artfulrobot]

@reafle Thanks for your fork, this solves this both issue for me and another issue I was having whereby vdebug only worked if you only had a single window open in neovim - if you had more than one window (or split) then the layout would go weird and be pretty much unusable. So thanks!

[BlackIkeEagle]

added in v2-integration, thanks