Fails when there is no window system

[duerrp]

I really like the eye-candy your code provides!
Unfortunately, I often work in a terminal and in that case the function pos-tip-window-system returns nil and flycheck-pos-tip-error-messages fails. My workaround is

(with-eval-after-load 'flycheck
  (defun peters-postip-error-messages (errors)
  (if (pos-tip-window-system)
      (flycheck-pos-tip-error-messages errors)
    (flycheck-display-error-messages errors)))
  (custom-set-variables
   '(flycheck-display-errors-function #'peters-postip-error-messages)))

but you could fix this for all of us by putting the branch into flycheck-pos-tip-error-messages.

Keep up the good work
Peter

[Deleted user]

Hi.
I tried to change the depend library, from pos-tip to popup.

flycheck-pos-tip.el

Please try this.
If there is no problem, I will merge this.