Allow recent apps to be launched with split screen pair from MediaProjectionAppSelector

Updating the logic so that when selecting a recent app to partial screenshare, if it is currently part of a split screen pair, the pair will be launched together

Bug: 320449039
Flag: ACONFIG com.android.systemui.pss_app_selector_recents_split_screeen DISABLED
Test: Manual testing
Test: atest ShellRecentTaskListProviderTest
Test: atest MediaProjectionAppSelectorControllerTest
Test: atest MediaProjectionRecentsViewControllerTest
Change-Id: Iff49ff89ea2367187f8ba34bad6730a1bb6f3738
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 6810aac9..2ad9854 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -148,6 +148,16 @@
 }
 
 flag {
+   name: "pss_app_selector_recents_split_screen"
+   namespace: "systemui"
+   description: "Allows recent apps selected for partial screenshare to be launched in split screen mode"
+   bug: "320449039"
+   metadata {
+        purpose: PURPOSE_BUGFIX
+   }
+}
+
+flag {
     name: "notifications_background_icons"
     namespace: "systemui"
     description: "Moves part of the notification icon updates to the background."