tild character must be escaped in hunk title ref #156

vimagit may want to search hunk position, based on hunk title.
When a hunk title has a '~' in it, the character make the search crash.
It must be escaped.

Finnally, after almost one year of open issue and several issue
contributors, I got it, thanks to akrejczinger and its docker image.

The reason I was unable to reproduce this issue is maybe that all the
vim and nvim version I used were built with another regex engine.

plugin/magit.vim

@@ -964,7 +964,13 @@ function! magit#stage_block(selection, discard) abort
 
 	" find current hunk position in file matching against current selection
 	" header
-	let hunk_id = match(map(deepcopy(file.get_hunks()), 'v:val.header'), escape(a:selection[0], '*'))
+	try
+		let hunk_id = match(map(deepcopy(file.get_hunks()), 'v:val.header'), escape(a:selection[0], '~*'))
+	catch /^Vim\%((\a\+)\)\=:E874/
+		echoerr "Escape issue with '" . a:selection[0] ."'"
+		return
+	endtry
+
 
 	if ( a:discard == 0 )
 		if ( section == 'unstaged' )