Because the lsp package sets the default checker to lsp (chaining not supported) I am using this WA to chain another checker to lsp:
(defvar-local my/flycheck-local-cache nil)
(defun my/flycheck-checker-get (fn checker property)
(or (alist-get property (alist-get checker my/flycheck-local-cache))
(funcall fn checker property)))
(advice-add 'flycheck-checker-get :around 'my/flycheck-checker-get)
(add-hook 'lsp-managed-mode-hook
(lambda ()
(when (derived-mode-p 'sh-mode)
(setq my/flycheck-local-cache '((lsp . ((next-checkers . (c/c++-cppcheck)))))))))
The WA works good, the, cppcheck checker is ran after the lsp one and the cppcheck issues are shown in the buffer.
The problem is that in lsp-ui-flycheck-list and lsp-treemacs-errors-list only the errors from the lsp checker are shown. How can I add the errors from cppcheck to lsp-ui as well?
