fix: remove diagnostics in help view

fixes #1088

lua/nvim-tree/actions/toggles.lua

@@ -2,6 +2,7 @@ local view = require "nvim-tree.view"
 local filters = require "nvim-tree.explorer.filters"
 local renderer = require "nvim-tree.renderer"
 local reloaders = require "nvim-tree.actions.reloaders"
+local diagnostics = require "nvim-tree.diagnostics"
 
 local M = {}
 
@@ -22,7 +23,12 @@ end
 
 function M.help()
   view.toggle_help()
-  return renderer.draw()
+  renderer.draw()
+  if view.is_help_ui() then
+    diagnostics.clear()
+  else
+    diagnostics.update()
+  end
 end
 
 return M

lua/nvim-tree/diagnostics.lua

@@ -103,16 +103,10 @@ local function is_using_coc()
   return vim.g.coc_service_initialized == 1
 end
 
-function M.update()
-  if not M.enable or not core.get_explorer() or not view.is_buf_valid(view.get_bufnr()) then
+function M.clear()
+  if not M.enable or not view.is_buf_valid(view.get_bufnr()) then
     return
   end
-  local buffer_severity
-  if is_using_coc() then
-    buffer_severity = from_coc()
-  else
-    buffer_severity = from_nvim_lsp()
-  end
 
   if #signs then
     vim.fn.sign_unplacelist(vim.tbl_map(function(sign)
@@ -124,6 +118,20 @@ function M.update()
     end, signs))
     signs = {}
   end
+end
+
+function M.update()
+  if not M.enable or not core.get_explorer() or not view.is_buf_valid(view.get_bufnr()) then
+    return
+  end
+  local buffer_severity
+  if is_using_coc() then
+    buffer_severity = from_coc()
+  else
+    buffer_severity = from_nvim_lsp()
+  end
+
+  M.clear()
   for bufname, severity in pairs(buffer_severity) do
     if 0 < severity and severity < 5 then
       local node, line = utils.find_node(core.get_explorer().nodes, function(node)