Possibility to specify the preview-window's color

[polijan]

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

Info

This is a feature request: add possibility to specify preview-window's bg / fg color via the --color option

Rationale: sometimes the content in the preview window is meant for a light theme while content piped to fzf is meant for dark theme (or the other way around). This case often typically happens when using a syntax highlighter filter as preview, and some tool (using LS_COLORS or own color scheme) for the fzf input.

[junegunn]