Improve reader horizontal mode scroll Y to X re-mapping

When scrolling really fast, the delta value could increase, which leads to incorrect trackpad detection, because the delta value is not consistent over consecutive scroll events

CHANGELOG.md

@@ -31,13 +31,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Library**) Fix showing incorrect info text for an empty category
 - (**Browse**) Prevent infinite loading in case the whole source catalogue has been added to the library and the "hide entries in library" setting is enabled
 - (**Browse**) Fix using incorrect native language name for some sources (e.g., different chinese languages (zh-hans, zh-hant, ...) were all showing the same native name)
-- (**Reader**) Fix mouse drag scrolling intertia effect being locked at 60hz
+- (**Reader**) Fix mouse drag scrolling inertia effect being locked at 60hz
 - (**Reader**) Fix mouse cursor drift during drag scroll
 - (**Reader**) Fix deletion of chapters while reading
 - (**Reader**) Fix potential page loss during window resize while using continuous horizontal 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
-- (**Backup**) Add option to exclude specific data during backup creation
+- (**Reader**) Fix broken scrolling in continuous horizontal reading mode
 
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