[jayhemnani9910]

A format field that ps can't fill yet prints its header but no value, so every value after it moves one column to the left:

$ ps -p 1 -l
 F  S  UID  PID  PPID      C        PRI  NI  ADDR  SZ  WCHAN  TTY  TIME  CMD
 0  1  0    ?    00:00:01  systemd
$ ps -p 1 -o stat,pid,comm
 STAT  PID      COMMAND
 1     systemd

The PID shows under S and the command under PID. collect_pickers skipped any code without a picker (stat, nice, pri, wchan, lstart, etimes, ...), while the header kept it. Such a field now prints -, which procps-ng also uses for a value it can't show:

$ ps -p 1 -l
 F  S  UID  PID  PPID  C  PRI  NI  ADDR  SZ  WCHAN  TTY  TIME      CMD
 -  -  0    1    0     -  -    -   -     -   -      ?    00:00:01  systemd

Filling in those fields is separate work; this only keeps the values under the right headers.

Tests: test_unimplemented_field_keeps_columns_aligned fails without the change. cargo test: 225 passed (224 on main); clippy clean.

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[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 19.50%. Comparing base (67832aa) to head (94eb472).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/ps/src/picker.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #824      +/-   ##
==========================================
+ Coverage   19.20%   19.50%   +0.30%     
==========================================
  Files          68       68              
  Lines       10156    10242      +86     
  Branches      546      552       +6     
==========================================
+ Hits         1950     1998      +48     
- Misses       8206     8244      +38     

Flag	Coverage Δ
macos_latest	6.75% <0.00%> (ø)
ubuntu_latest	19.86% <93.75%> (+0.31%)	⬆️
windows_latest	0.02% <0.00%> (ø)

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