Avoid creating new timer for each invocation of lsp-treemacs-symbols (#90) (#91)

Co-authored-by: Shitikanth Kashyap <shitikanth1@gmail.com>

Author: shitikanth

lsp-treemacs.el

@@ -375,7 +375,8 @@ will be rendered an empty line between them."
         (setq-local treemacs-default-visit-action 'treemacs-RET-action)
         (setq-local treemacs-space-between-root-nodes
                     lsp-treemacs-symbols-space-between-root-nodes)
-        (setq lsp-treemacs--symbols-timer (run-at-time 0 1.0 #'lsp-treemacs--update))
+	(unless lsp-treemacs--symbols-timer
+	  (setq lsp-treemacs--symbols-timer (run-with-idle-timer 1 t #'lsp-treemacs--update)))
         (add-hook 'kill-buffer-hook 'lsp-treemacs--kill-symbols-buffer nil t)))
     (with-current-buffer original-buffer (lsp-treemacs--update))))