fix(#2519): Diagnostics Not Updated When Tree Not Visible (#2597)

* fix(#2519): diagnostics overhaul

Signed-off-by: iusmac <iusico.maxim@libero.it>

* fix: Properly filter diagnostics from coc

Also, while we're at it, refactor the lsp function for consistency.
There should be no functional change, just cosmetic.

Signed-off-by: iusmac <iusico.maxim@libero.it>

* Assign diagnostic version per node to reduce overhead

Signed-off-by: iusmac <iusico.maxim@libero.it>

* Require renderer once

Signed-off-by: iusmac <iusico.maxim@libero.it>

* Revert "Require renderer once"

Causes circular requires after the previous commit.

This reverts commit 7413041630.

* Rename `buffer_severity_dict` to `BUFFER_SEVERITY`

Signed-off-by: iusmac <iusico.maxim@libero.it>

* Log diagnostics update properly

Signed-off-by: iusmac <iusico.maxim@libero.it>

* Implement error handling for coc.nvim

Signed-off-by: iusmac <iusico.maxim@libero.it>

* CI style fixes

Signed-off-by: iusmac <iusico.maxim@libero.it>

* Capture `Keyboard interrupt` when handling coc exceptions

Signed-off-by: iusmac <iusico.maxim@libero.it>

* add more doc

---------

Signed-off-by: iusmac <iusico.maxim@libero.it>
Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/actions/moves/item.lua

@@ -3,6 +3,7 @@ local view = require "nvim-tree.view"
 local core = require "nvim-tree.core"
 local lib = require "nvim-tree.lib"
 local explorer_node = require "nvim-tree.explorer.node"
+local diagnostics = require "nvim-tree.diagnostics"
 
 local M = {}
 
@@ -33,7 +34,8 @@ function M.fn(opts)
         local git_status = explorer_node.get_git_status(node)
         valid = git_status ~= nil and (not opts.skip_gitignored or git_status[1] ~= "!!")
       elseif opts.what == "diag" then
-        valid = node.diag_status ~= nil
+        local diag_status = diagnostics.get_diag_status(node)
+        valid = diag_status ~= nil and diag_status.value ~= nil
       elseif opts.what == "opened" then
         valid = vim.fn.bufloaded(node.absolute_path) ~= 0
       end