revert: "feat(health): fold successful healthchecks #22866"

This reverts commit 4382d2ed564b80944345785d780cf1b19fb23ba8.

The story for this feature was left in an incomplete state. It was never
the intention to unilaterally fold all information, only the ones that
did not contain relevant information. This feature does more harm than
good in its incomplete state.

3 files changed, 1 insertions, 42 deletions

diff --git a/runtime/doc/news.txt b/runtime/doc/news.txt
index c219762c3f..066a076377 100644
--- a/runtime/doc/news.txt
+++ b/runtime/doc/news.txt
@@ -393,9 +393,6 @@ The following changes to existing APIs or features add new behavior.
 • |:lua| with a |[range]| executes that range in the current buffer as Lua code
   regardless of its extension.
 
-• |:checkhealth| buffer now implements |folding|. The initial folding status is
-  defined by the 'foldenable' option.
-
 • |:Man| now respects 'wrapmargin'
 
 • |gx| now uses |vim.ui.open()| and not netrw. To customize, you can redefine
diff --git a/runtime/ftplugin/checkhealth.vim b/runtime/ftplugin/checkhealth.vim
index 4b530e6f7c..62a1970b4a 100644
--- a/runtime/ftplugin/checkhealth.vim
+++ b/runtime/ftplugin/checkhealth.vim
@@ -9,9 +9,6 @@ endif
 runtime! ftplugin/help.vim
 
 setlocal wrap breakindent linebreak
-setlocal foldexpr=getline(v:lnum-1)=~'^=\\{78}$'?'>1':(getline(v:lnum)=~'^=\\{78}'?0:'=')
-setlocal foldmethod=expr
-setlocal foldtext=v:lua.require('vim.health').foldtext()
 let &l:iskeyword='!-~,^*,^|,^",192-255'
 
 if exists("b:undo_ftplugin")
diff --git a/runtime/lua/vim/health.lua b/runtime/lua/vim/health.lua
index 9e9c557ad3..18d20d4b40 100644
--- a/runtime/lua/vim/health.lua
+++ b/runtime/lua/vim/health.lua
@@ -2,42 +2,7 @@ local M = {}
 
 local s_output = {} ---@type string[]
 
---- Returns the fold text of the current healthcheck section
-function M.foldtext()
-  local foldtext = vim.fn.foldtext()
-
-  if vim.bo.filetype ~= 'checkhealth' then
-    return foldtext
-  end
-
-  if vim.b.failedchecks == nil then
-    vim.b.failedchecks = vim.empty_dict()
-  end
-
-  if vim.b.failedchecks[foldtext] == nil then
-    local warning = '- WARNING '
-    local warninglen = string.len(warning)
-    local err = '- ERROR '
-    local errlen = string.len(err)
-    local failedchecks = vim.b.failedchecks
-    failedchecks[foldtext] = false
-
-    local foldcontent = vim.api.nvim_buf_get_lines(0, vim.v.foldstart - 1, vim.v.foldend, false)
-    for _, line in ipairs(foldcontent) do
-      if string.sub(line, 1, warninglen) == warning or string.sub(line, 1, errlen) == err then
-        failedchecks[foldtext] = true
-        break
-      end
-    end
-
-    vim.b.failedchecks = failedchecks
-  end
-
-  return vim.b.failedchecks[foldtext] and '+WE' .. foldtext:sub(4) or foldtext
-end
-
---- @param path string path to search for the healthcheck
---- @return string[] { name, func, type } representing a healthcheck
+-- From a path return a list [{name}, {func}, {type}] representing a healthcheck
 local function filepath_to_healthcheck(path)
   path = vim.fs.normalize(path)
   local name --- @type string