Temporary hide notifications when folding/unfolding

This should reduce latency with complex notifications
by postponing the relayout.

Bug: 293824309
Test: atest HideNotificationsInteractorTest
Test: atest ConfigurationInteractorTest
Test: atest UnfoldTransitionInteractorTest
Flag: ACONFIG notifications_hide_on_display_switch DISABLED
Change-Id: I4cd6b718adc15b6c8261afe90437e7644702f56e
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 8f350a7..04c96ab 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -38,6 +38,13 @@
 }
 
 flag {
+    name: "notifications_hide_on_display_switch"
+    namespace: "systemui"
+    description: "Temporary hides notifications when folding/unfolding to reduce unfold latency"
+    bug: "293824309"
+}
+
+flag {
     name: "notification_lifetime_extension_refactor"
     namespace: "systemui"
     description: "Enables moving notification lifetime extension management from SystemUI to "