Bug 682507 - Expose browser restore state as a tab attribute to help style unloaded tabs. r=dietrich

browser/base/content/tabbrowser.xml

@@ -4177,6 +4177,11 @@
             aMenuitem.removeAttribute("busy");
           }
 
+          if (aTab.hasAttribute("pending"))
+            aMenuitem.setAttribute("pending", aTab.getAttribute("pending"));
+          else
+            aMenuitem.removeAttribute("pending");
+
           if (aTab.selected)
             aMenuitem.setAttribute("selected", "true");
           else

browser/components/sessionstore/src/nsSessionStore.js

@@ -2825,6 +2825,7 @@ SessionStoreService.prototype = {
       // a tab gets closed before it's been properly restored
       browser.__SS_data = tabData;
       browser.__SS_restoreState = TAB_STATE_NEEDS_RESTORE;
+      tab.setAttribute("pending", "true");
 
       // Make sure that set/getTabValue will set/read the correct data by
       // wiping out any current value in tab.__SS_extdata.
@@ -3007,6 +3008,7 @@ SessionStoreService.prototype = {
 
     // Set this tab's state to restoring
     browser.__SS_restoreState = TAB_STATE_RESTORING;
+    aTab.removeAttribute("pending");
 
     // Remove the history listener, since we no longer need it once we start restoring
     this._removeSHistoryListener(aTab);

browser/components/sessionstore/test/browser/Makefile.in

@@ -152,6 +152,7 @@ _BROWSER_TEST_FILES = \
 	browser_645428.js \
 	browser_659591.js \
 	browser_662812.js \
+	browser_682507.js \
 	$(NULL)
 
 ifneq ($(OS_ARCH),Darwin)

browser/components/sessionstore/test/browser/browser_682507.js

@@ -0,0 +1,16 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  Services.prefs.setBoolPref("browser.sessionstore.restore_on_demand", true);
+  gBrowser.addTab("about:mozilla");
+
+  ss.setTabState(gBrowser.tabs[1], ss.getTabState(gBrowser.tabs[1]));
+  ok(gBrowser.tabs[1].hasAttribute("pending"), "second tab should have 'pending' attribute");
+
+  gBrowser.selectedTab = gBrowser.tabs[1];
+  ok(!gBrowser.tabs[1].hasAttribute("pending"), "second tab should have not 'pending' attribute");
+
+  gBrowser.removeTab(gBrowser.tabs[1]);
+  Services.prefs.clearUserPref("browser.sessionstore.restore_on_demand");
+}