Modify views to observe changes when active, not just foreground.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -4441,7 +4441,7 @@ typedef enum : NSUInteger {
 
 - (void)updateShouldObserveDBModifications
 {
-    BOOL isAppForegroundAndActive = CurrentAppContext().reportedApplicationState == UIApplicationStateActive;
+    BOOL isAppForegroundAndActive = CurrentAppContext().isAppForegroundAndActive;
     self.shouldObserveDBModifications = self.isViewVisible && isAppForegroundAndActive;
 }
 

Signal/src/ViewControllers/HomeView/HomeViewController.m

@@ -485,7 +485,7 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
 
 - (void)updateShouldObserveDBModifications
 {
-    BOOL isAppForegroundAndActive = CurrentAppContext().reportedApplicationState == UIApplicationStateActive;
+    BOOL isAppForegroundAndActive = CurrentAppContext().isAppForegroundAndActive;
     self.shouldObserveDBModifications = self.isViewVisible && isAppForegroundAndActive;
 }
 

Signal/src/util/MainAppContext.m

@@ -156,6 +156,11 @@ NS_ASSUME_NONNULL_BEGIN
     return self.reportedApplicationState == UIApplicationStateBackground;
 }
 
+- (BOOL)isAppForegroundAndActive
+{
+    return self.reportedApplicationState == UIApplicationStateActive;
+}
+
 - (UIBackgroundTaskIdentifier)beginBackgroundTaskWithExpirationHandler:
     (BackgroundTaskExpirationHandler)expirationHandler
 {

SignalMessaging/Views/ThreadViewHelper.m

@@ -79,8 +79,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)updateShouldObserveDBModifications
 {
-    BOOL isAppForegroundAndActive = CurrentAppContext().reportedApplicationState == UIApplicationStateActive;
+    self.shouldObserveDBModifications = CurrentAppContext().isAppForegroundAndActive;
-    self.shouldObserveDBModifications = isAppForegroundAndActive;
 }
 
 // Don't observe database change notifications when the app is in the background.

SignalServiceKit/src/Util/AppContext.h

@@ -55,6 +55,11 @@ NSString *NSStringForUIApplicationState(UIApplicationState value);
 // This method is thread-safe.
 - (BOOL)isInBackground;
 
+// A convenience accessor for reportedApplicationState.
+//
+// This method is thread-safe.
+- (BOOL)isAppForegroundAndActive;
+
 // Should start a background task if isMainApp is YES.
 // Should just return UIBackgroundTaskInvalid if isMainApp is NO.
 - (UIBackgroundTaskIdentifier)beginBackgroundTaskWithExpirationHandler:

SignalShareExtension/utils/ShareAppExtensionContext.m

@@ -151,6 +151,11 @@ NS_ASSUME_NONNULL_BEGIN
     return self.reportedApplicationState == UIApplicationStateBackground;
 }
 
+- (BOOL)isAppForegroundAndActive
+{
+    return self.reportedApplicationState == UIApplicationStateActive;
+}
+
 - (UIBackgroundTaskIdentifier)beginBackgroundTaskWithExpirationHandler:
     (BackgroundTaskExpirationHandler)expirationHandler
 {