Fix infinite scroll intersection info calculation

Scrollbars need to be considered since they decrease the available viewport size in which the element can be visible

src/modules/reader/components/viewer/ReaderChapterViewer.tsx

@@ -416,6 +416,8 @@ const BaseReaderChapterViewer = ({
                     isPreviousChapterVisible={isPreviousChapterVisible}
                     isNextChapterVisible={isNextChapterVisible}
                     imageWrapper={pagerRef.current}
+                    scrollbarXSize={scrollbarXSize}
+                    scrollbarYSize={scrollbarYSize}
                 />
             )}
             {showPreviousTransitionPage && (

src/modules/reader/components/viewer/ReaderInfiniteScrollUpdateChapter.tsx

@@ -9,7 +9,7 @@
 import { memo } from 'react';
 import { withPropsFrom } from '@/modules/core/hoc/withPropsFrom.tsx';
 import { useReaderInfiniteScrollUpdateChapter } from '@/modules/reader/hooks/useReaderInfiniteScrollUpdateChapter.ts';
-import { ReadingDirection, ReadingMode } from '@/modules/reader/types/Reader.types.ts';
+import { ReadingDirection, ReadingMode, TReaderScrollbarContext } from '@/modules/reader/types/Reader.types.ts';
 import { ReaderControls } from '@/modules/reader/services/ReaderControls.ts';
 import { ChapterIdInfo } from '@/modules/chapter/services/Chapters.ts';
 
@@ -24,7 +24,9 @@ const BaseReaderInfiniteScrollUpdateChapter = ({
     isNextChapterVisible,
     imageWrapper,
     openChapter,
-}: {
+    scrollbarXSize,
+    scrollbarYSize,
+}: Pick<TReaderScrollbarContext, 'scrollbarXSize' | 'scrollbarYSize'> & {
     readingMode: ReadingMode;
     readingDirection: ReadingDirection;
     chapterId: ChapterIdInfo['id'];
@@ -46,6 +48,8 @@ const BaseReaderInfiniteScrollUpdateChapter = ({
         readingDirection,
         openChapter,
         imageWrapper,
+        scrollbarXSize,
+        scrollbarYSize,
     );
     useReaderInfiniteScrollUpdateChapter(
         'last',
@@ -57,6 +61,8 @@ const BaseReaderInfiniteScrollUpdateChapter = ({
         readingDirection,
         openChapter,
         imageWrapper,
+        scrollbarXSize,
+        scrollbarYSize,
     );
 
     return null;

src/modules/reader/hooks/useReaderInfiniteScrollUpdateChapter.ts

@@ -36,18 +36,23 @@ const OPEN_CHAPTER_INTERSECTION_RATIO = 0;
 const getElementIntersectionInfo = (
     readingDirection: ReadingDirection,
     { top, right, bottom, left }: DOMRect,
+    scrollbarXSize: number,
+    scrollbarYSize: number,
 ): ElementIntersectionInfo => {
     const themeDirectionOfReadingDirection = READING_DIRECTION_TO_THEME_DIRECTION[readingDirection];
 
-    const startOfViewportHorizontal = getOptionForDirection(0, window.innerWidth, themeDirectionOfReadingDirection);
+    const viewportWidth = window.innerWidth - scrollbarYSize;
-    const endOfViewportHorizontal = getOptionForDirection(window.innerWidth, 0, themeDirectionOfReadingDirection);
+    const viewportHeight = window.innerHeight - scrollbarXSize;
+
+    const startOfViewportHorizontal = getOptionForDirection(0, viewportWidth, themeDirectionOfReadingDirection);
+    const endOfViewportHorizontal = getOptionForDirection(viewportWidth, 0, themeDirectionOfReadingDirection);
 
     const startOfElementHorizontal = getOptionForDirection(left, right, themeDirectionOfReadingDirection);
     const endOfElementHorizontal = getOptionForDirection(right, left, themeDirectionOfReadingDirection);
 
     return {
         [ReadingMode.CONTINUOUS_VERTICAL]: {
-            start: bottom >= window.innerHeight,
+            start: bottom >= viewportHeight,
             end: top < 0,
         },
         [ReadingMode.CONTINUOUS_HORIZONTAL]: {
@@ -188,6 +193,8 @@ export const useReaderInfiniteScrollUpdateChapter = (
     readingDirection: ReadingDirection,
     openChapter: ReturnType<typeof ReaderControls.useOpenChapter>,
     image: HTMLElement | null,
+    scrollbarXSize: number,
+    scrollbarYSize: number,
 ) => {
     useIntersectionObserver(
         image,
@@ -202,6 +209,8 @@ export const useReaderInfiniteScrollUpdateChapter = (
                 const elementIntersectionInfo = getElementIntersectionInfo(
                     readingDirection,
                     entry.target.getBoundingClientRect(),
+                    scrollbarXSize,
+                    scrollbarYSize,
                 );
                 const { start: isStartIntersecting, end: isEndIntersecting } = getElementIntersection(
                     elementIntersectionInfo,
@@ -239,6 +248,8 @@ export const useReaderInfiniteScrollUpdateChapter = (
                 readingMode,
                 readingDirection,
                 openChapter,
+                scrollbarXSize,
+                scrollbarYSize,
             ],
         ),
         useMemo(