Bug 1878944 - Fixing the sometimes not sent e-mail about the acceptance/rejection of appointments r=mkmelin

Currently, the email address in the account and the one used in the invitation must match one to one. This means that emails cannot be sent if there is a difference in capitalization.
This is now fixed by this code change.

Differential Revision: https://phabricator.services.mozilla.com/D207474

--HG--
extra : amend_source : 5892eae5c102b4f18876e917d7a45611797451fd

calendar/base/modules/utils/calItipUtils.sys.mjs

@@ -1380,9 +1380,9 @@ export var itip = {
     const id = item.getProperty("X-MOZ-INVITED-ATTENDEE");
 
     if (id) {
-      const email = id.split("mailto:").join("");
+      const email = id.replace(/^mailto:/i, "").toLowerCase();
       const identity = MailServices.accounts.allIdentities.find(
-        identity => identity.email == email
+        identity => identity.email.toLowerCase() == email
       );
 
       if (identity) {

calendar/test/unit/test_itip_utils.js

@@ -806,7 +806,7 @@ add_task(function test_getImipTransport() {
   // With X-MOZ-INVITED-ATTENDEE property.
   const account2 = MailServices.accounts.createAccount();
   const identity2 = MailServices.accounts.createIdentity();
-  identity2.email = "id2@example.com";
+  identity2.email = "ID2@example.com";
   account2.addIdentity(identity2);
   account2.incomingServer = MailServices.accounts.createIncomingServer(
     "id2",
@@ -814,7 +814,7 @@ add_task(function test_getImipTransport() {
     "imap"
   );
 
-  event.setProperty("X-MOZ-INVITED-ATTENDEE", "mailto:id2@example.com");
+  event.setProperty("X-MOZ-INVITED-ATTENDEE", "MAILTO:id2@EXAMPLE.com");
 
   const customTransport = cal.itip.getImipTransport(event);
   Assert.ok(customTransport);