Assign diagnostic version per node to reduce overhead

Signed-off-by: iusmac <[email protected]>

Author: iusmac

lua/nvim-tree/diagnostics.lua

@@ -15,6 +15,10 @@ local severity_levels = {
 ---@type table
 local buffer_severity_dict = {}
 
+--- The cache version number of the buffer-severity mappings.
+---@type integer
+local BUFFER_SEVERITY_VERSION = 0
+
 ---@param path string
 ---@return string
 local function uniformize_path(path)
@@ -91,6 +95,7 @@ function M.update()
     else
       buffer_severity_dict = from_nvim_lsp()
     end
+    BUFFER_SEVERITY_VERSION = BUFFER_SEVERITY_VERSION + 1
     log.node("diagnostics", buffer_severity_dict, "update")
     log.profile_end(profile)
     if view.is_buf_valid(view.get_bufnr()) then
@@ -101,7 +106,7 @@ end
 
 ---@param node Node
 function M.update_node_severity_level(node)
-  if not M.enable then
+  if not M.enable or node.diag_status_version == BUFFER_SEVERITY_VERSION then
     return
   end
 
@@ -127,6 +132,7 @@ function M.update_node_severity_level(node)
   else
     node.diag_status = buffer_severity_dict[nodepath]
   end
+  node.diag_status_version = BUFFER_SEVERITY_VERSION
 end
 
 function M.setup(opts)

lua/nvim-tree/node.lua

@@ -18,6 +18,7 @@
 ---@field type string
 ---@field watcher function|nil
 ---@field diag_status integer|nil
+---@field diag_status_version integer|nil
 
 ---@class DirNode: BaseNode
 ---@field has_children boolean