Drop deprecated options

[dandavison]

Fixes 906-912 but let's close them when this is released.

[Iron-E]

Ever since this change I have been having an issue with git:

❯ git diff main
error: Found argument '--plus-color' which wasn't expected, or isn't valid in this context

	Did you mean '--plus-style'?

	If you tried to supply `--plus-color` as a value rather than a flag, use `-- --plus-color`

USAGE:
    delta --plus-style <STYLE>

For more information try --help

Here is my .gitconfig:

[core]
	pager = delta

[interactive]
	diffFilter = delta --color-only

[delta]
	navigate = true  # use n and N to move between diff sections

[merge]
	conflictstyle = diff3

[diff]
	colorMoved = default

(This is the same as the example from the README)

[dandavison]

Hi @Iron-E, somehow you must be passing --plus-color to delta. Perhaps an environment variable, or an alias.

To investigate aliases, can you post the results of which delta and type -a delta and which git and type -a git?

To investigate relevant environment variables, in particular GIT_PAGER, could you run the command

env | grep -i pager

I can reproduce the error you see by setting the value of GIT_PAGER like this:

src/delta(master) GIT_PAGER='delta --plus-color=green' git show
error: Found argument '--plus-color' which wasn't expected, or isn't valid in this context

Another possibility is that git is using a config file different from, or in addition to, the one you showed.

[Iron-E]

$GIT_PAGER was it. Thank you!