substitution pattern in function ack#Ack should be case-sensitive

[NewComer00]

Plugin Version

• Vim 9.0.749
• mileszs/ack.vim 36e40f9

Bug Reproduction

.vimrc

set ignorecase
let g:ackprg = 'ag --vimgrep --hidden --ignore .git'

Input command in Vim

:AckFile! filename

Error appeared in Quickfix List

ag: invalid option -- 'd'

Expected behavior

No error appears.

Possible Cause

When set ignorecase is specified in .vimrc, the substitution pattern in function ack#Ack will also become case-insensitive.

			*'ignorecase'* *'ic'* *'noignorecase'* *'noic'*
'ignorecase' 'ic'	boolean	(default off)
			global
	Ignore case in search patterns.  Also used when searching in the tags
	file.
	Also see 'smartcase'.
	Can be overruled by using "\c" or "\C" in the pattern, see
	|/ignorecase|.

The -h in --hidden from the value of g:ackprg will be substituted by '', leaving a wrong-shaped command ag --vimgrep -idden --ignore .git.

ack.vim/autoload/ack.vim

Lines 28 to 31 in 36e40f9

	if s:SearchingFilepaths()
	let l:grepprg = substitute(l:grepprg, '-H\|--column', '', 'g')
	let l:grepformat = '%f'
	endif

Fix

Append \C to the pattern

 if s:SearchingFilepaths() 
   let l:grepprg = substitute(l:grepprg, '-H\|--column\C', '', 'g') 
   let l:grepformat = '%f' 
 endif