[lsp-ui-doc] Fix frame positioning when bound is outside window #519

Author: sebastiencs

lsp-ui-doc.el

@@ -467,7 +467,10 @@ symbol at point, to not obstruct the view of the code that follows.
 If there's no space above in the current window, it places
 FRAME just below the symbol at point."
   (-let* (((x . y) (--> (or lsp-ui-doc--bounds (bounds-of-thing-at-point 'symbol))
-                        (posn-x-y (posn-at-point (car it)))))
+                        (or (posn-x-y (posn-at-point (car it)))
+                            (if (< (car it) (window-start))
+                                (cons 0 0)
+                              (posn-x-y (posn-at-point (1- (window-end))))))))
           (frame-relative-symbol-x (+ start-x x))
           (frame-relative-symbol-y (+ start-y y))
           (char-height (frame-char-height))