Bug 1550662 - Make "Reload All Tabs" simply discard browsers when switching Content Blocking modes. r=mconley,johannh

Differential Revision: https://phabricator.services.mozilla.com/D34524

--HG--
extra : moz-landing-system : lando

browser/components/preferences/in-content/privacy.js

@@ -1150,19 +1150,26 @@ var gPrivacyPane = {
   },
 
   /**
-   * Reload all tabs in all windows, except the active Preferences tab.
+   * Discard the browsers of all tabs in all windows. Pinned tabs, as
+   * well as tabs for which discarding doesn't succeed (e.g. selected
+   * tabs, tabs with beforeunload listeners), are reloaded.
    */
   reloadAllOtherTabs() {
-    let activeWindow = window.BrowserWindowTracker.getTopWindow();
-    let selectedPrefTab = activeWindow.gBrowser.selectedTab;
-    for (let win of window.BrowserWindowTracker.orderedWindows) {
-      let tabbrowser = win.gBrowser;
-      let tabsToReload = [...tabbrowser.tabs];
-      if (win == activeWindow ) {
-        tabsToReload = tabsToReload.filter(tab => tab !== selectedPrefTab);
+    let ourTab = BrowserWindowTracker.getTopWindow().gBrowser.selectedTab;
+    BrowserWindowTracker.orderedWindows.forEach(win => {
+      let otherGBrowser = win.gBrowser;
+      for (let tab of otherGBrowser.tabs) {
+        if (tab == ourTab) {
+          // Don't reload our preferences tab.
+          continue;
+        }
+
+        if (tab.pinned || !otherGBrowser.discardBrowser(tab)) {
+          otherGBrowser.reloadTab(tab);
+        }
       }
-      tabbrowser.reloadTabs(tabsToReload);
-    }
+    });
+
     for (let notification of document.querySelectorAll(".reload-tabs")) {
       notification.hidden = true;
     }

browser/components/preferences/in-content/tests/browser_contentblocking.js

@@ -525,6 +525,8 @@ add_task(async function testContentBlockingReloadWarning() {
 add_task(async function testReloadTabsMessage() {
   Services.prefs.setStringPref(CAT_PREF, "strict");
   let exampleTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "http://example.com");
+  let examplePinnedTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "http://example.com");
+  gBrowser.pinTab(examplePinnedTab);
   await openPreferencesViaOpenPreferencesAPI("privacy", {leaveOpen: true});
   let doc = gBrowser.contentDocument;
   let standardWarning = doc.querySelector("#contentBlockingOptionStandard .content-blocking-warning.reload-tabs");
@@ -533,14 +535,19 @@ add_task(async function testReloadTabsMessage() {
   Services.prefs.setStringPref(CAT_PREF, "standard");
   ok(!BrowserTestUtils.is_hidden(standardWarning), "The warning in the standard section should be showing");
 
+  let exampleTabBrowserDiscardedPromise = BrowserTestUtils.waitForEvent(exampleTab, "TabBrowserDiscarded");
+  let examplePinnedTabLoadPromise = BrowserTestUtils.browserLoaded(examplePinnedTab.linkedBrowser);
   standardReloadButton.click();
-  // The example page had a load event
-  await BrowserTestUtils.browserLoaded(exampleTab.linkedBrowser);
+  // The pinned example page had a load event
+  await examplePinnedTabLoadPromise;
+  // The other one had its browser discarded
+  await exampleTabBrowserDiscardedPromise;
 
   ok(BrowserTestUtils.is_hidden(standardWarning), "The warning in the standard section should have hidden after being clicked");
 
   // cleanup
   Services.prefs.setStringPref(CAT_PREF, "standard");
   gBrowser.removeTab(exampleTab);
+  gBrowser.removeTab(examplePinnedTab);
   gBrowser.removeCurrentTab();
 });