Clean up state code

state.js

@@ -30,21 +30,17 @@ function currentSectionFromHash (signedIn) {
   }
 
   // Normalise all paths so they do not end in a slash.
-  if (section !== '/' && section.endsWith('/')) {
-    section = section.slice(0, section.length - 1)
-  }
+  if (section !== '/' && section.endsWith('/')) { section = section.slice(0, section.length - 1) }
 
   // Normalise index path.
-  if (section === '') { section = '/';}
+  if (section === '') { section = '/'; }
 
-  if (section !== location.hash.replace('#', '')) {
-    location.hash = section
-  }
+  // If we’ve updated the section path, update the hash also.
+  if (section !== location.hash.replace('#', '')) { location.hash = section }
 
   // Check if this is a known path and show 404 page if it’s not.
-  if (!sectionPaths.includes(section)) {
-    section = '/404'
-  }
+  // (Note: we do not update the hash here on purpose so the original missing path is shown.)
+  if (!sectionPaths.includes(section)) { section = '/404' }
 
   return section
 }