Bug 1741521 - Revert changes to TabAttrModified event from bug 1683865. r=mkmelin

Differential Revision: https://phabricator.services.mozilla.com/D131294

--HG--
extra : rebase_source : b05cfed0fdc43837a205a4e295a1926f98024eaf

mail/base/content/tabmail.js

@@ -1756,7 +1756,7 @@
           let evt = new CustomEvent("TabAttrModified", {
             bubbles: true,
             cancelable: false,
-            detail: { change: "title", tabInfo: tab },
+            detail: { changed: ["label"], tabInfo: tab },
           });
           tabNode.dispatchEvent(evt);
         }
@@ -1789,7 +1789,7 @@
         let evt = new CustomEvent("TabAttrModified", {
           bubbles: true,
           cancelable: false,
-          detail: { change: "favIconUrl", tabInfo },
+          detail: { changed: ["favIconUrl"], tabInfo },
         });
         tabInfo.tabNode.dispatchEvent(evt);
       }

mail/components/extensions/parent/ext-tabs.js

@@ -168,17 +168,15 @@ class TabsUpdateFilterEventManager extends EventManager {
       let listener = event => {
         let changeInfo = {};
         let tab = tabManager.getWrapper(event.detail.tabInfo);
-        switch (event.detail.change) {
-          case "favIconUrl":
-            if (filter.properties.has("favIconUrl")) {
-              changeInfo.favIconUrl = tab.favIconUrl;
-            }
-            break;
-          case "title":
-            if (filter.properties.has("title")) {
-              changeInfo.title = tab.title;
-            }
-            break;
+        let changed = event.detail.changed;
+        if (
+          changed.includes("favIconUrl") &&
+          filter.properties.has("favIconUrl")
+        ) {
+          changeInfo.favIconUrl = tab.favIconUrl;
+        }
+        if (changed.includes("label") && filter.properties.has("title")) {
+          changeInfo.title = tab.title;
         }
 
         fireForTab(tab, changeInfo);