[hover] Display the last MarkedString when there are multiple.

Author: MaskRay

lsp-methods.el

@@ -1229,16 +1229,18 @@ type MarkedString = string | { language: string; value: string };"
             (lsp--point-is-within-bounds-p start end)
             (eq (current-buffer) buffer) (eldoc-display-message-p))
       (let ((contents (gethash "contents" hover)))
-        (eldoc-message
-          (mapconcat (lambda (e)
-                       (let (renderer)
-                         (if (hash-table-p e)
-                           (if (setq renderer (cdr (assoc-string
-                                                     (gethash "language" e) renderers)))
-                             (funcall renderer (gethash "value" e))
-                             (gethash "value" e))
-                           e)))
-            (if (listp contents) contents (list contents)) "\n"))))))
+        ;; We may receive multiple MarkedString's in the Hover response,
+        ;; render the last one because others are likely comments which will
+        ;; make the eldoc message span multiple lines.
+        (when-let* ((e (if (consp contents) (car (last contents)) contents)))
+          (let (renderer)
+            (eldoc-message
+              (if (hash-table-p e)
+                (if (setq renderer (cdr (assoc-string
+                                          (gethash "language" e) renderers)))
+                  (funcall renderer (gethash "value" e))
+                  (gethash "value" e))
+                e))))))))
 
 (defun lsp-provide-marked-string-renderer (client language renderer)
   (cl-check-type language string)