Flush memory cache at key filtering profile changes

To reduce the need for hard reload after changes in filters,
rules.

platform/common/vapi-background.js

@@ -1298,6 +1298,9 @@ vAPI.Net = class {
         this.listenerMap.set(clientListener, actualListener);
         return actualListener;
     }
+    handlerBehaviorChanged() {
+        browser.webRequest.handlerBehaviorChanged();
+    }
     onUnprocessedRequest(details) {
         const { tabId } = details;
         if ( tabId === -1 ) { return; }

src/js/start.js

@@ -459,6 +459,10 @@ if ( selfieIsValid !== true ) {
     }
 }
 
+// Flush memory cache -- unsure whether the browser does this internally
+// when loading a new extension.
+vAPI.net.handlerBehaviorChanged();
+
 // Final initialization steps after all needed assets are in memory.
 
 // https://github.com/uBlockOrigin/uBlock-issues/issues/974

src/js/storage.js

@@ -19,7 +19,7 @@
     Home: https://github.com/gorhill/uBlock
 */
 
-/* globals browser, WebAssembly */
+/* globals WebAssembly */
 
 'use strict';
 
@@ -581,9 +581,7 @@ self.addEventListener('hiddenSettingsChanged', ( ) => {
 
     // https://www.reddit.com/r/uBlockOrigin/comments/cj7g7m/
     // https://www.reddit.com/r/uBlockOrigin/comments/cnq0bi/
-    if ( options.killCache ) {
-        browser.webRequest.handlerBehaviorChanged();
-    }
+    vAPI.net.handlerBehaviorChanged();
 
     vAPI.messaging.broadcast({ what: 'userFiltersUpdated' });
 };
@@ -818,6 +816,7 @@ self.addEventListener('hiddenSettingsChanged', ( ) => {
         staticExtFilteringEngine.freeze();
         redirectEngine.freeze();
         vAPI.net.unsuspend();
+        vAPI.net.handlerBehaviorChanged();
 
         vAPI.storage.set({ 'availableFilterLists': µb.availableFilterLists });
 

src/js/ublock.js

@@ -187,6 +187,10 @@ const matchBucket = function(url, hostname, bucket, start) {
         }
     }
     this.saveWhitelist();
+
+    // Flush memory cache
+    vAPI.net.handlerBehaviorChanged();
+
     return true;
 };
 
@@ -521,6 +525,11 @@ const matchBucket = function(url, hostname, bucket, start) {
     // https://github.com/chrisaljoudi/uBlock/issues/420
     cosmeticFilteringEngine.removeFromSelectorCache(srcHostname, 'net');
 
+    // Flush memory cache
+    if ( action === 1 ) {
+        vAPI.net.handlerBehaviorChanged();
+    }
+
     if ( details.tabId === undefined ) { return; }
 
     if ( requestType.startsWith('3p') ) {
@@ -577,7 +586,7 @@ const matchBucket = function(url, hostname, bucket, start) {
     );
     if ( changed === false ) { return; }
 
-    // Take action if needed
+    // Take per-switch action if needed
     switch ( details.name ) {
         case 'no-scripting':
             this.updateToolbarIcon(details.tabId, 0b100);
@@ -596,6 +605,20 @@ const matchBucket = function(url, hostname, bucket, start) {
                 pageStore.temporarilyAllowLargeMediaElements(!newState);
             }
             break;
+        default:
+            break;
+    }
+
+    // Flush memory cache if needed
+    if ( newState ) {
+        switch ( details.name ) {
+            case 'no-scripting':
+            case 'no-remote-fonts':
+                vAPI.net.handlerBehaviorChanged();
+                break;
+            default:
+                break;
+        }
     }
 
     if ( details.persist !== true ) { return; }