[feature] --keep-left=COL to preserve COL number of leftmost columns while searching

[haakonstorm]

• I have read through the manual page (man fzf)
• I have the latest version of fzf
• I have searched through the existing issues

Info

• OS
  • Linux
  • Mac OS X
• Shell
  • bash
  • zsh

Problem / Steps to reproduce

1. See attached screenshots for illustration

Here the word(s) on the left is the name of what is actually selected (via fzf). The right side text is the "friendly name" description of what is to be selected. This is a small tool dubbed pmm for now "package manager manager" I'm making for search discovery and install of "packages" like brew formulae, casks, kubernetes helm charts, pypi, npn nodejs, etc.

In full technicolor (ANSI) 😀

[haakonstorm]

Perhaps AWK style index: --keep-left-nth={1} as a way to [semi]-automatically determine number of columns to save.
Not sure what to do when matching substrings are spread over too many columns. I.e. wider than terminal $columns. In this particular use case the left-most word is the most important info.