3 files changed, 24 insertions, 8 deletions

diff --git a/src/js/3p-filters.js b/src/js/3p-filters.js
index a3e81b8..b5fca1b 100644
--- a/src/js/3p-filters.js
+++ b/src/js/3p-filters.js
@@ -371,8 +371,22 @@ var onPurgeClicked = function() {
     if ( !href ) {
         return;
     }
+
     messager.send({ what: 'purgeCache', path: href });
     button.remove();
+
+    // If the cached version is purged, the installed version must be assumed
+    // to be obsolete.
+    var entry = listDetails.current && listDetails.current[href];
+    if ( entry && entry.off !== true ) {
+        if ( typeof entry.homeURL !== 'string' || entry.homeURL === '' ) {
+            li.descendants('span.status.new').css('display', '');
+        } else {
+            li.descendants('span.status.obsolete').css('display', '');
+        }
+        needUpdate = true;
+    }
+
     if ( li.descendants('input').first().prop('checked') ) {
         cacheWasPurged = true;
         renderWidgets();
diff --git a/src/js/assets.js b/src/js/assets.js
index 21878f8..08616c5 100644
--- a/src/js/assets.js
+++ b/src/js/assets.js
@@ -412,10 +412,12 @@ var getRepoMetadata = function(callback) {
             // If the resource does not have a cached instance, we must reset
             // the checksum to its value at install time.
             if (
-                cachedAssetsManager.exists(path) === false &&
-                stringIsNotEmpty(defaultChecksums[path])
+                stringIsNotEmpty(defaultChecksums[path]) &&
+                entry.localChecksum !== defaultChecksums[path] &&
+                cachedAssetsManager.exists(path) === false
             ) {
                 entry.localChecksum = defaultChecksums[path];
+                checksumsChanged = true;
             }
             // If repo checksums could not be fetched, assume no change.
             // https://github.com/gorhill/uBlock/issues/602
@@ -1211,17 +1213,17 @@ exports.metadata = function(callback) {
 /******************************************************************************/
 
 exports.purge = function(pattern, before) {
-    // Purging means we should mark resources current metadata as obsolete.
-    lastRepoMetaTimestamp = 0;
-
     cachedAssetsManager.remove(pattern, before);
 };
 
-exports.purgeAll = function(callback) {
-    // Purging means we should mark resources current metadata as obsolete.
+exports.purgeCacheableAsset = function(pattern, before) {
+    cachedAssetsManager.remove(pattern, before);
     lastRepoMetaTimestamp = 0;
+};
 
+exports.purgeAll = function(callback) {
     cachedAssetsManager.removeAll(callback);
+    lastRepoMetaTimestamp = 0;
 };
 
 /******************************************************************************/
diff --git a/src/js/messaging.js b/src/js/messaging.js
index 2841fef..6076f8d 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -815,7 +815,7 @@ var onMessage = function(request, sender, callback) {
 
     switch ( request.what ) {
     case 'purgeCache':
-        µb.assets.purge(request.path);
+        µb.assets.purgeCacheableAsset(request.path);
         break;
 
     default: