Fix upgrade launch screen.

// FREEBIE

Signal/src/AppDelegate.m

@@ -199,13 +199,22 @@ static NSString *const kURLHostVerifyPrefix             = @"verify";
         [[UIStoryboard storyboardWithName:@"Launch Screen" bundle:nil] instantiateInitialViewController];
 
     BOOL shouldShowUpgradeLabel = NO;
-    NSString *previousVersion = AppVersion.instance.lastCompletedLaunchAppVersion;
+    NSString *lastAppVersion = AppVersion.instance.lastAppVersion;
+    NSString *lastCompletedLaunchAppVersion = AppVersion.instance.lastCompletedLaunchAppVersion;
+    BOOL mayNeedUpgrade = ([TSAccountManager isRegistered] &&
+        [VersionMigrations isVersion:lastAppVersion atLeast:@"2.0.0" andLessThan:@"2.13.0"]);
+    BOOL hasCompletedUpgrade = (lastCompletedLaunchAppVersion &&
+        [VersionMigrations isVersion:lastCompletedLaunchAppVersion atLeast:@"2.13.0"]);
+
     // We added a number of database views in v2.13.0.
-    if ([TSAccountManager isRegistered] &&
+    if (mayNeedUpgrade && !hasCompletedUpgrade) {
-        [VersionMigrations isVersion:previousVersion atLeast:@"2.0.0" andLessThan:@"2.13.0"]) {
         shouldShowUpgradeLabel = YES;
     }
-    DDLogInfo(@"%@ shouldShowUpgradeLabel: %d", self.tag, shouldShowUpgradeLabel);
+    DDLogInfo(@"%@ shouldShowUpgradeLabel: %d, %d -> %d",
+        self.tag,
+        mayNeedUpgrade,
+        hasCompletedUpgrade,
+        shouldShowUpgradeLabel);
     if (shouldShowUpgradeLabel) {
         UIView *rootView = viewController.view;
         UIImageView *iconView = nil;

Signal/src/environment/VersionMigrations.h

@@ -16,4 +16,6 @@
           atLeast:(NSString *)openLowerBoundVersionString
       andLessThan:(NSString *)closedUpperBoundVersionString;
 
++ (BOOL)isVersion:(NSString *)thisVersionString atLeast:(NSString *)thatVersionString;
+
 @end