From a498fdf17d2e543b44d71637adcae668acce3194 Mon Sep 17 00:00:00 2001
From: Stephen Fenton <stephenfenton@MacBookPro.localdomain>
Date: Tue, 29 Jul 2025 17:39:02 -0700
Subject: [PATCH] Fix EPUB.js CFI navigation bug

- Add patch-package to client dependencies
- Add postinstall script to apply patches automatically
- Add patch for EPUB.js v0.3.93 to fix CFI navigation
- Changes scrollBy to scrollTo in continuous manager for proper absolute positioning
- Fixes issue where CFI navigation loads content but target is outside viewport

This resolves CFI-based features like bookmarks, highlights, and reading position sync.
---
 client/package.json                |  4 +++-
 client/patches/epubjs+0.3.93.patch | 37 ++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 client/patches/epubjs+0.3.93.patch

diff --git a/client/package.json b/client/package.json
index 788117101..ad8659900 100644
--- a/client/package.json
+++ b/client/package.json
@@ -12,7 +12,8 @@
     "generate": "nuxt generate",
     "test": "npm run compile-tailwind && cypress run --component --browser chrome",
     "test-visually": "npm run compile-tailwind && cypress open --component --browser chrome",
-    "compile-tailwind": "npx @tailwindcss/cli -i ./assets/tailwind.css -o ./cypress/support/tailwind.compiled.css"
+    "compile-tailwind": "npx @tailwindcss/cli -i ./assets/tailwind.css -o ./cypress/support/tailwind.compiled.css",
+    "postinstall": "patch-package"
   },
   "author": "advplyr",
   "license": "ISC",
@@ -38,6 +39,7 @@
   "devDependencies": {
     "@nuxtjs/pwa": "^3.3.5",
     "@tailwindcss/cli": "^4.0.14",
+    "patch-package": "^8.0.0",
     "postcss": "^8.3.6",
     "tailwindcss": "^4.0.13"
   },
diff --git a/client/patches/epubjs+0.3.93.patch b/client/patches/epubjs+0.3.93.patch
new file mode 100644
index 000000000..481f77a73
--- /dev/null
+++ b/client/patches/epubjs+0.3.93.patch
@@ -0,0 +1,37 @@
+diff --git a/node_modules/epubjs/lib/managers/continuous/index.js b/node_modules/epubjs/lib/managers/continuous/index.js
+index 4912876..a27dec2 100644
+--- a/node_modules/epubjs/lib/managers/continuous/index.js
++++ b/node_modules/epubjs/lib/managers/continuous/index.js
+@@ -91,14 +91,12 @@ class ContinuousViewManager extends _default2.default {
+     } else {
+       distX = Math.floor(offset.left / this.layout.delta) * this.layout.delta;
+       offsetX = distX + this.settings.offsetDelta;
+-    }
+-
+-    if (distX > 0 || distY > 0) {
+-      this.scrollBy(distX, distY, true);
+-    }
+-  }
++		}
+ 
+-  afterResized(view) {
++		if (distX > 0 || distY > 0) {
++			this.scrollTo(distX, distY, true);
++		}
++	}  afterResized(view) {
+     this.emit(_constants.EVENTS.MANAGERS.RESIZE, view.section);
+   } // Remove Previous Listeners if present
+ 
+diff --git a/node_modules/epubjs/src/managers/continuous/index.js b/node_modules/epubjs/src/managers/continuous/index.js
+index d61f8f7..0743938 100644
+--- a/node_modules/epubjs/src/managers/continuous/index.js
++++ b/node_modules/epubjs/src/managers/continuous/index.js
+@@ -90,7 +90,7 @@ class ContinuousViewManager extends DefaultViewManager {
+ 		}
+ 
+ 		if (distX > 0 || distY > 0) {
+-			this.scrollBy(distX, distY, true);
++			this.scrollTo(distX, distY, true);
+ 		}
+ 	}
+