:Toc does not work with other quickfix list plugins

ftplugin/markdown.vim

@@ -377,7 +377,7 @@ function! s:Toc(...)
  endif
  endif
  " indent header based on level
- let l:text = repeat(' ', h.level-1) . h.text
+ let l:text = h.level . '# ' . h.text
  " keep track of the longest header size (heading level + title)
  let l:total_len = strdisplaywidth(l:text)
  if l:total_len > l:header_max_len
@@ -405,14 +405,6 @@ function! s:Toc(...)
  else
  lopen
  endif
- setlocal modifiable
- for i in range(1, line('$'))
- " this is the location-list data for the current item
- let d = getloclist(0)[i-1]
- call setline(i, d.text)
- endfor
- setlocal nomodified
- setlocal nomodifiable
  execute 'normal! ' . l:cursor_header . 'G'
 endfunction
 

test/folding-toc.vader

@@ -121,28 +121,28 @@ Execute (check TOC):
  let res = getloclist(0)
  let elem = res[0]
  AssertEqual elem.lnum, 1
- AssertEqual elem.text, 'chap 1'
+ AssertEqual elem.text, '1# chap 1'
  let elem = res[1]
  AssertEqual elem.lnum, 15
- AssertEqual elem.text, '  chap 1.1'
+ AssertEqual elem.text, '2# chap 1.1'
  let elem = res[2]
  AssertEqual elem.lnum, 25
- AssertEqual elem.text, '  chap 1.1.1'
+ AssertEqual elem.text, '3# chap 1.1.1'
  let elem = res[3]
  AssertEqual elem.lnum, 30
- AssertEqual elem.text, 'chap 2'
+ AssertEqual elem.text, '1# chap 2'
  let elem = res[4]
  AssertEqual elem.lnum, 34
- AssertEqual elem.text, '  chap 2.1'
+ AssertEqual elem.text, '2# chap 2.1'
  let elem = res[5]
  AssertEqual elem.lnum, 41
- AssertEqual elem.text, 'chap 3'
+ AssertEqual elem.text, '1# chap 3'
  let elem = res[6]
  AssertEqual elem.lnum, 45
- AssertEqual elem.text, 'chap 4'
+ AssertEqual elem.text, '1# chap 4'
  let elem = res[7]
  AssertEqual elem.lnum, 50
- AssertEqual elem.text, '  chap 4.1'
+ AssertEqual elem.text, '2# chap 4.1'
 
 Given markdown;
 ---
@@ -175,5 +175,5 @@ Execute (check Toc of yaml front matter):
  AssertEqual len(res), 1
  let elem = res[0]
  AssertEqual elem.lnum, 8
- AssertEqual elem.text, '  heading'
+ AssertEqual elem.text, '2# heading'
  unlet g:vim_markdown_frontmatter

test/toc-autofit.vader

@@ -45,9 +45,9 @@ Execute (toc window autofit width):
  :Toc
  let real_width = winwidth(0)
  :lclose
- let expected_width = len(line) + 2*5 + 1 + 3 - 7
+ let expected_width = len(line) - len(matchstr(line, '^#\+ *')) + 1 + 3 + len('N# ')
  AssertEqual real_width, expected_width
  set nonumber
-" 2 spaces * 5 additional header levels + 1 space for first header +
-" 3 spaces for line numbers - 7 chars ('###### ') that don't show up on the TOC
+" 1 space for first header + 3 spaces for line numbers.
+" 7 chars ('###### ') are removed, and 3 char `N# ` are added.
 

test/toc.vader

@@ -28,11 +28,14 @@ test
 
 Execute (Toc setex headers):
  :Toc
+ :setl modifiable
+ :%s/\m^\([^|]*|\)\{2} //
+ :setl nomodifiable nomodified
 
 Expect (setex headers):
- header 1
-   header 2
-   header 3
+ 1# header 1
+ 2# header 2
+ 3# header 3
 
 Given markdown;
 # header 1
@@ -49,11 +52,14 @@ test
 
 Execute (Toc atx headers):
  :Toc
+ :setl modifiable
+ :%s/\m^\([^|]*|\)\{2} //
+ :setl nomodifiable nomodified
 
 Expect (atx headers):
- header 1
-   header 2
-   header 3
+ 1# header 1
+ 2# header 2
+ 3# header 3
 
 Given markdown;
 ATX tests.
@@ -135,34 +141,37 @@ setex h2
 
 Execute (Toc multiple headers):
  :Toc
+ :setl modifiable
+ :%s/\m^\([^|]*|\)\{2} //
+ :setl nomodifiable nomodified
 
 Expect (multiple headers):
- h1 space
- h1 nospace
- h1 2 spaces
- h1 trailing hash
-   h2 space
-   h2 nospace
-   h2 trailing hash
-   h3 space
-   h3 nospace
-   h3 trailing hash
-   h4
-   h5
-   h6
- h1 before h2
-   h2 between h1s
- h1 after h2
- setex h1
-   setex h2
- setex h1 single punctuation
- setex h1 punctuation longer than header
- setex h1 before atx
-   atx h2
-   atx h3
- atx h1
-   setex h2
-   atx h3 2
+ 1# h1 space
+ 1# h1 nospace
+ 1# h1 2 spaces
+ 1# h1 trailing hash
+ 2# h2 space
+ 2# h2 nospace
+ 2# h2 trailing hash
+ 3# h3 space
+ 3# h3 nospace
+ 3# h3 trailing hash
+ 4# h4
+ 5# h5
+ 6# h6
+ 1# h1 before h2
+ 2# h2 between h1s
+ 1# h1 after h2
+ 1# setex h1
+ 2# setex h2
+ 1# setex h1 single punctuation
+ 1# setex h1 punctuation longer than header
+ 1# setex h1 before atx
+ 2# atx h2
+ 3# atx h3
+ 1# atx h1
+ 2# setex h2
+ 3# atx h3 2
 
 Execute:
  :lclose