List index out of range caused by missing priority in sign place output

[serpent7776]

I got hit by an error opening a file with sign marks

Error detected while processing function <SNR>89_callback_vim_close[9]..<SNR>89_handle_diff[32]..sy#sign#set_signs[20]..sy#sign#process_diff[5]..sy#sign#get_current_signs[4]..sy#util#get_signs:
line   10:
E684: List index out of range: 1
E116: Invalid arguments for function str2nr(tokens[1])
E15: Invalid expression: str2nr(tokens[1])
line   11:
E684: List index out of range: 2
E116: Invalid arguments for function str2nr(tokens[2])
E15: Invalid expression: str2nr(tokens[2])
line   12:
E684: List index out of range: 3
E15: Invalid expression: tokens[3]
line   13:
E684: List index out of range: 4
E116: Invalid arguments for function str2nr(tokens[4])
E15: Invalid expression: str2nr(tokens[4])
line   15:
E121: Undefined variable: line
E116: Invalid arguments for function add

script 89 is this one:

 89: ~/.vim/plugged/vim-signify/autoload/sy/repo.vim

The issue seems to be with regex passed to matchlist here:

vim-signify/autoload/sy/util.vim

Line 245 in 6a9499c

let tokens = matchlist(signline, '\v^\s+\S+\=(\d+)\s+\S+\=(\d+)\s+\S+\=(.*)\s+\S+\=(\d+)$')

When I execute sign place buffer=n on a problematic file I get

--- Signs ---
Signs for util.vim:
    line=247  id=263  name=SignifyAdd
    line=247  id=261  name=SignifyAdd
    line=247  id=259  name=SignifyAdd
    line=247  id=258  name=SignifyAdd
    line=247  id=257  name=SignifyAdd
    line=247  id=256  name=SignifyAdd
    line=249  id=264  name=SignifyAdd
    line=249  id=262  name=SignifyAdd
    line=249  id=260  name=SignifyAdd

On different machine that doesn't have this issue the result is different (it's for different file):

--- Signs ---
Signs for README.md:
    line=44  id=256  name=SignifyAdd  priority=10
    line=45  id=257  name=SignifyAdd  priority=10
    line=46  id=258  name=SignifyAdd  priority=10
    line=47  id=259  name=SignifyAdd  priority=10
    line=48  id=260  name=SignifyAdd  priority=10

Looks like priority is missing and that's why regex doesn't match.

If I change regex to '\v^\s+\S+\=(\d+)\s+\S+\=(\d+)\s+\S+\=(\w+)(\s+\S+\=(\d+))?$' and bump the index when assigning to priority variable (let priority = str2nr(tokens[5])) it works fine for me, but that's probably not an acceptable fix to the issue.