completion: complete --ws-error-highlight

Add --ws-error-highlight= to the list in __git_diff_common_options, and
add the accepted values in a new list __git_ws_error_highlight_opts.

Use __git_ws_error_highlight_opts in _git_diff, _git_log and _git_show
to offer the accepted values.

As noted in fd0bc17 (completion: add diff --color-moved[-ws],
2020-02-21), there is no easy way to offer completion for several
comma-separated values, so this is limited to completing a single
value.

Signed-off-by: Philippe Blain <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: phil-blain

contrib/completion/git-completion.bash

@@ -1733,6 +1733,8 @@ __git_color_moved_opts="no default plain blocks zebra dimmed-zebra"
 __git_color_moved_ws_opts="no ignore-space-at-eol ignore-space-change
 			ignore-all-space allow-indentation-change"
 
+__git_ws_error_highlight_opts="context old new all default"
+
 # Options for the diff machinery (diff, log, show, stash, range-diff, ...)
 __git_diff_common_options="--stat --numstat --shortstat --summary
 			--patch-with-stat --name-only --name-status --color
@@ -1790,6 +1792,10 @@ _git_diff ()
 		__gitcomp "$__git_color_moved_ws_opts" "" "${cur##--color-moved-ws=}"
 		return
 		;;
+	--ws-error-highlight=*)
+		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
+		return
+		;;
 	--*)
 		__gitcomp "$__git_diff_difftool_options"
 		return
@@ -2080,6 +2086,10 @@ _git_log ()
 		__gitcomp "$__git_diff_submodule_formats" "" "${cur##--submodule=}"
 		return
 		;;
+	--ws-error-highlight=*)
+		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
+		return
+		;;
 	--no-walk=*)
 		__gitcomp "sorted unsorted" "" "${cur##--no-walk=}"
 		return
@@ -3000,6 +3010,10 @@ _git_show ()
 		__gitcomp "$__git_color_moved_ws_opts" "" "${cur##--color-moved-ws=}"
 		return
 		;;
+	--ws-error-highlight=*)
+		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
+		return
+		;;
 	--*)
 		__gitcomp "--pretty= --format= --abbrev-commit --no-abbrev-commit
 			--oneline --show-signature