a better fix that uses internal resolveUrl routine

ChangeLog.txt

@@ -1,3 +1,6 @@
+v031
+  - simplify bug fix to use existing functions in reader.js
+
 v030
   - bug fix to correct Toc navigation error as it needs opf relative paths
 

README.md

@@ -2,7 +2,7 @@
 
 Updated: June 8, 2021
 
-Current Version: "0.3.0"
+Current Version: "0.3.1"
 
 This plugin implements an epub3 reader for the epub currently being edited in Sigil.
 It uses PyQt5 and PyQtWebengine to create a browser like main window and then loads

epubjs_reader_bug_fixes.patch → epubjs_reader_better_bug_fix.patch

@@ -1,19 +1,18 @@
---- reader/js/reader.js.orig	2021-06-08 09:45:16.000000000 -0400
-+++ reader/js/reader.js	2021-06-08 09:51:48.000000000 -0400
-@@ -4310,7 +4310,11 @@
+--- reader.js.orig	2021-06-08 10:17:52.000000000 -0400
++++ reader.js	2021-06-08 13:47:16.000000000 -0400
+@@ -4310,7 +4310,10 @@
 
  	$list.append(docfrag);
  	$list.find(".toc_link").on("click", function(event){
 -			var url = this.getAttribute('href');
 +            // convert href to be relative to the opf not ncx or nav
 +            var ahref = this.getAttribute('href');
 +            var basePath = book.packaging.navPath || book.packaging.ncxPath
-+            var base = 'https://example.invalid/'
-+            var url = new URL(ahref, base + basePath).href.replace(base, '')
++            var url = EPUBJS.core.resolveUrl(basePath, ahref)
 
  			event.preventDefault();
 
-@@ -4344,4 +4348,4 @@
+@@ -4344,4 +4347,4 @@
  	};
  };
 

plugin.xml

@@ -5,7 +5,7 @@
 <author>Sigil</author>
 <description>Provide a FuturePress EpubJS Reader to view the current epub being edited</description>
 <engine>python3.4</engine>
-<version>0.3.0</version>
+<version>0.3.1</version>
 <autostart>true</autostart>
 <autoclose>true</autoclose>
 <oslist>osx,win,unx</oslist>