fix: better dirty state

[zzhaolei]

Current dirty status may be incorrect, use better detection method

Incorrect, Nothing actually changes:

Correct:

Performance:
No performance regression.

(Can it be tested like this?🤔)

[zzhaolei]

@jorgebucaran Please review this PR

[jorgebucaran]

This is probably good. I also had a couple of weird issues with the dirty status. Thank you! I just need to test it on the wild for a while before we're able to merge.

[zzhaolei]

Hello, I have been using it for three weeks and haven't noticed any problems. Can it be merged?

[jorgebucaran]

Good to know, thanks!

[zzhaolei]

Now we can use this:

Old

``` count (git status --porcelain=v2 --untracked-files=no) >/dev/null; or count (command git ls-files --others --exclude-standard) >/dev/null; and set info \"$hydro_symbol_git_dirty\" ```

Edited:
Now we can use this:

count (git status --porcelain=v2 --untracked-files=no) >/dev/null;
    or count (command git ls-files --others --exclude-standard \$(command git rev-parse --show-toplevel)) >/dev/null;
    and set info \"$hydro_symbol_git_dirty\"

# Incorrect outputs
❯ time command git ls-files --others --exclude-standard                                                                                                    [17:37:03]

________________________________________________________
Executed in   28.84 millis    fish           external
   usr time   16.23 millis    0.09 millis   16.14 millis
   sys time   10.42 millis    1.08 millis    9.33 millis

# Correct outputs
❯ time command git ls-files --others --exclude-standard ..                                                                                                 [17:37:05]
../1

________________________________________________________
Executed in  941.38 millis    fish           external
   usr time  202.08 millis    0.11 millis  201.97 millis
   sys time  777.69 millis    1.10 millis  776.59 millis

# Correct outputs
❯ time command git ls-files --others --exclude-standard $(command git rev-parse --show-toplevel)                                                           [17:37:10]
../1

________________________________________________________
Executed in  930.11 millis    fish           external
   usr time  198.21 millis    0.12 millis  198.09 millis
   sys time  769.98 millis    1.20 millis  768.78 millis

~/R/nixpkgs/lib master• >