Fix marking chapter as read once end is reached by scrolling

CHANGELOG.md

@@ -40,6 +40,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Reader**) Fix wrongly positioned mobile progress bar current page indicator
 - (**Reader**) Fix mobile progress bar previous/next chapter button visibility on hover and while disabled
 - (**Reader**) Fix jumping back to the first page on window resize
+- (**Reader**) Fix chapter not getting marked as read in continuous reading mode in case the last page is not big enough to get marked as the current page
 - (**Browse**) Fix showing only nsfw sources in the browse source page when the "show nsfw" setting is disabled
 
 ## [20260509.01] (r3147) - 2026-05-09

src/features/reader/services/ReaderControls.ts

@@ -498,7 +498,6 @@ export class ReaderControls {
             (image) =>
                 image &&
                 isPageInViewport(image, type, {
-                    truncateValues: true,
                     thresholds: {
                         bottom: 1,
                         left: getOptionForDirection(

src/features/reader/viewer/pager/ReaderPager.utils.tsx

@@ -351,7 +351,7 @@ type InViewportOptions = {
 };
 const getIsPageInViewportInfo = (
     element: HTMLElement,
-    { truncateValues, thresholds: argThresholds }: InViewportOptions = { truncateValues: false, thresholds: {} },
+    { truncateValues, thresholds: argThresholds }: InViewportOptions = { truncateValues: true, thresholds: {} },
 ): {
     isLeftInViewport: boolean;
     isRightInViewport: boolean;
@@ -425,8 +425,9 @@ export const isEndOfPageInViewport = (
     element: HTMLElement,
     type: PageInViewportType,
     direction: ReadingDirection,
+    options?: InViewportOptions,
 ): boolean => {
-    const { isLeftInViewport, isRightInViewport, isBottomInViewport } = getIsPageInViewportInfo(element);
+    const { isLeftInViewport, isRightInViewport, isBottomInViewport } = getIsPageInViewportInfo(element, options);
 
     switch (type) {
         case PageInViewportType.X: