fix(updates): handle nightly downgrade message (#6842)

Co-authored-by: Wissididom <30803034+Wissididom@users.noreply.github.com>

Author: pajlada

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unversioned
 
+- Bugfix: Improve nightly downgrade message. (#6842)
+
 ## 2.5.5-beta.1
 
 - Minor: Added a countdown timer to the input box to show when you can chat again during slow mode or after a timeout. This feature is disabled by default, and can be enabled with the "Show countdown on slow mode or when timed out" setting. (#6782, #6791)

src/singletons/Updates.cpp

@@ -459,6 +459,15 @@ QString Updates::buildUpdateAvailableText() const
     if (version.isNightly())
     {
         // Since Nightly builds can be installed in many different ways, we ask the user to download the update manually.
+        if (this->isDowngrade())
+        {
+            return QString("The version online (%1) seems to be lower than the "
+                           "current (%2).\nEither a version was reverted or "
+                           "you are running a newer build.\n\nDo you want to "
+                           "head to Chatterino.com to download it?")
+                .arg(this->getOnlineVersion(), this->getCurrentVersion());
+        }
+
         return QString("An update (%1) is available.\n\nDo you want to head to "
                        "Chatterino.com to download the new update?")
             .arg(this->getOnlineVersion());

tests/src/Updates.cpp

@@ -29,6 +29,8 @@ TEST(Updates, MustBeDowngrade)
         << "2.4.5-beta must be a downgrade of 2.4.5-beta.2";
     EXPECT_TRUE(Updates::isDowngradeOf("2.4.5-beta.2", "2.4.6-beta.1"))
         << "2.4.5-beta.2 must be a downgrade of 2.4.6-beta.1";
+    EXPECT_TRUE(Updates::isDowngradeOf("2.5.4", "2.5.5-beta.1"))
+        << "2.5.4 must be a downgrade of 2.5.5-beta.1";
 }
 
 TEST(Updates, MustNotBeDowngrade)