Fix first visible page detection in RTL + continuous horizontal mode

CHANGELOG.md

@@ -35,6 +35,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Reader**) Fix mouse cursor drift during drag scroll
 - (**Reader**) Fix deletion of chapters while reading
 - (**Reader**) Fix potential page loss (continuous horizontal mode window resize, reader width change, page scale change)
+  (**Reader**) Fix current page detection in continuous horizontal mode with right-to-left reading mode
 - (**Extension**) Fix handling obsolete extensions as updatable in case they are marked as having an available update
 - (**Theme**) Fix loading of fonts defined in themes
 - (**Reader**) Fix broken scrolling in continuous horizontal reading mode

src/features/reader/services/ReaderControls.ts

@@ -506,7 +506,7 @@ export class ReaderControls {
                     // visible (e.g. 0.0123px) breaking the "first visible image" detection
                     {
                         bottom: 1,
-                        left: getOptionForDirection(0, window.innerWidth + 1, themeDirectionForReadingDirection),
+                        left: getOptionForDirection(0, 1, themeDirectionForReadingDirection),
                         right: getOptionForDirection(1, 0, themeDirectionForReadingDirection),
                     },
                 ),