SL-11216: To display release notes, listen on "relnotes" LLEventPump.

Now, when the viewer decides it's appropriate to display release notes on the
login screen, wait for SLVersionChecker to post the release-notes URL before
opening the web floater.

1 files changed, 18 insertions, 2 deletions

diff --git a/indra/newview/llstartup.cpp b/indra/newview/llstartup.cpp
index 2c0bbbc850..2f6853ba7b 100644
--- a/indra/newview/llstartup.cpp
+++ b/indra/newview/llstartup.cpp
@@ -2366,13 +2366,29 @@ void login_callback(S32 option, void *userdata)
 void show_release_notes_if_required()
 {
     static bool release_notes_shown = false;
+    // We happen to know that instantiating LLVersionInfo implicitly
+    // instantiates the LLEventMailDrop named "relnotes", which we (might) use
+    // below. If viewer release notes stop working, might be because that
+    // LLEventMailDrop got moved out of LLVersionInfo and hasn't yet been
+    // instantiated.
     if (!release_notes_shown && (LLVersionInfo::instance().getChannelAndVersion() != gLastRunVersion)
         && LLVersionInfo::instance().getViewerMaturity() != LLVersionInfo::TEST_VIEWER // don't show Release Notes for the test builds
         && gSavedSettings.getBOOL("UpdaterShowReleaseNotes")
         && !gSavedSettings.getBOOL("FirstLoginThisInstall"))
     {
-        LLSD info(LLAppViewer::instance()->getViewerInfo());
-        LLWeb::loadURLInternal(info["VIEWER_RELEASE_NOTES_URL"]);
+        // Instantiate a "relnotes" listener which assumes any arriving event
+        // is the release notes URL string. Since "relnotes" is an
+        // LLEventMailDrop, this listener will be invoked whether or not the
+        // URL has already been posted. If so, it will fire immediately;
+        // otherwise it will fire whenever the URL is (later) posted. Either
+        // way, it will display the release notes as soon as the URL becomes
+        // available.
+        LLEventPumps::instance().obtain("relnotes").listen(
+            "showrelnotes",
+            [](const LLSD& url){
+                LLWeb::loadURLInternal(url.asString());
+                return false;
+            });
         release_notes_shown = true;
     }
 }