Patch 8.2.4942
Problem:    Error when setting 'filetype' in help file again.
Solution:   Deal with text property type already existing. (closes #10409)
Files:      runtime/import/dist/vimhelp.vim


*** ../vim-8.2.4941/runtime/import/dist/vimhelp.vim     2022-05-06 
16:32:21.569543796 +0100
--- runtime/import/dist/vimhelp.vim     2022-05-12 17:20:47.699437843 +0100
***************
*** 9,19 ****
    while getline(lnum) !~ '===' && lnum < line('$')
      var word: string = getline(lnum)->matchstr('^\w\+\ze\t')
      if word->hlexists()
!       prop_type_add('help-hl-' .. word, {
!       bufnr: buf,
!       highlight: word,
!       combine: false,
!       })
        prop_add(lnum, 1, {length: word->strlen(), type: 'help-hl-' .. word})
      endif
      ++lnum
--- 9,25 ----
    while getline(lnum) !~ '===' && lnum < line('$')
      var word: string = getline(lnum)->matchstr('^\w\+\ze\t')
      if word->hlexists()
!       var name = 'help-hl-' .. word
!       if prop_type_list({bufnr: buf})->match(name) == -1
!       prop_type_add('help-hl-' .. word, {
!         bufnr: buf,
!         highlight: word,
!         combine: false,
!         })
!       else
!       # was called before, delete existing properties
!       prop_remove({type: name, bufnr: buf})
!       endif
        prop_add(lnum, 1, {length: word->strlen(), type: 'help-hl-' .. word})
      endif
      ++lnum
*** ../vim-8.2.4941/src/version.c       2022-05-12 15:39:27.815703293 +0100
--- src/version.c       2022-05-12 17:17:10.059455707 +0100
***************
*** 748,749 ****
--- 748,751 ----
  {   /* Add new patch number below this line */
+ /**/
+     4942,
  /**/

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