The history command is no longer loaded by an exported variable
because its value might be overwritten by user initialization
scripts of global/non-interactive shell session types.
The command is also now improved in the following ways:
- The timestamp/date prefix has always the $fish_color_comment
color, even on fish versions where the syntax highlighting colors
are not supported.
- The $fish_color_comment value is taken from the current shell
session (there are cases where the variable might be undefined in
a non-interactive subshell).
Fix#4862
bitraid
b163463079