Accommodate pixel-scroll-precision-mode

Author: aikrahguzar

Diff for: lisp/pdf-roll.el

@@ -209,6 +209,8 @@ It should be added to `pre-redisplay-functions' buffer locally."
   (with-demoted-errors "Error in image roll pre-redisplay: %S"
     (unless (pdf-roll-page-overlay 1 win)
       (pdf-roll-new-window-function win))
+    (when (memq last-command '(pixel-scroll-precision pixel-scroll-start-momentum))
+      (pdf-roll-set-vscroll (window-vscroll win t) win))
     (let* ((state (alist-get win pdf-roll--state))
            (page (pdf-roll-current-page win))
            (height (window-pixel-height win))