Provide option to not blindly foreground app's lastWindow from deepLi…

…nks (microsoft#1355)

Messenger Desktop is a multi-window application (chat, calling, settings, …) and we maintain the various windows with a windowNativeModule which allows JS interaction.

When receiving deep-links from other apps we don’t want to necessary re-open the lastWindow open as the deep-link might contain information about a particular scenario (open login page, start a call). Hence, we need to disable this behavior app wide and use our windowNativeModule to forward the specific window related to the deep link.

- This change has 0 effect on other apps
- We could make this property an ivar, but then we need to manually register RCTLinkingManager.mm ….
- We could append a special url property to deep-links, but I think that would make the ‘API’ harder to use`

Libraries/LinkingIOS/RCTLinkingManager.h

@@ -15,6 +15,7 @@
 
 #if TARGET_OS_OSX // [TODO(macOS GH#774)
 + (void)getUrlEventHandler:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent;
++ (void)setAlwaysForegroundLastWindow:(BOOL)alwaysForeground;
 #else // ]TODO(macOS GH#774)
 + (BOOL)application:(nonnull UIApplication *)app
             openURL:(nonnull NSURL *)URL

Libraries/LinkingIOS/macos/RCTLinkingManager.mm

@@ -21,6 +21,7 @@
 
 static NSString *initialURL = nil;
 static BOOL moduleInitalized = NO;
+static BOOL alwaysForegroundLastWindow = YES;
 
 static void postNotificationWithURL(NSString *url, id sender)
 {
@@ -60,6 +61,11 @@ - (void)stopObserving
     return @[@"url"];
 }
 
++ (void)setAlwaysForegroundLastWindow:(BOOL)alwaysForeground
+{
+    alwaysForegroundLastWindow = alwaysForeground;
+}
+
 + (void)getUrlEventHandler:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent
 {
     // extract url value from the event
@@ -76,12 +82,13 @@ + (void)getUrlEventHandler:(NSAppleEventDescriptor *)event withReplyEvent:(NSApp
 
 - (void)handleOpenURLNotification:(NSNotification *)notification
 {
-    // foreground top level window, need to grab it like this, because [NSApp mainWindow] returns nil when the app is hidden
-    // and another app is maximized
+    // Activate app, because [NSApp mainWindow] returns nil when the app is hidden and another app is maximized
     [NSApp activateIgnoringOtherApps:YES];
-    NSWindow *lastWindow = [[NSApp windows] lastObject];
-    [lastWindow makeKeyAndOrderFront:nil];
-
+    // foreground top level window
+    if (alwaysForegroundLastWindow) {      
+      NSWindow *lastWindow = [[NSApp windows] lastObject];
+      [lastWindow makeKeyAndOrderFront:nil];
+    }
     [self sendEventWithName:@"url" body:notification.userInfo];
 }