[Testing] [macOS] Fix screenshot masking and scaling for Retina (high-DPI) displays

eng/pipelines/ci-uitests.yml

@@ -143,8 +143,9 @@ parameters:
   - name: macosPoolPublic
     type: object
     default:
-      name: Azure Pipelines
-      vmImage: macOS-14
+      name: AcesShared
+      demands:
+        - ImageOverride -equals ACES_VM_SharedPool_Tahoe
 
 stages:
 

eng/scripts/disable-notification-center.sh

@@ -1,22 +1,54 @@
-#!/bin/sh 
+#!/bin/sh
 
-export PATH=/usr/bin:/bin:/usr/sbin:/sbin 
+# Suppress macOS system dialogs and notifications that interfere with UI tests.
+# This script runs before MacCatalyst UI tests in CI to prevent system-level
+# windows (e.g., Apple Sign-In, Setup Assistant, onboarding tips) from blocking
+# app interaction and appearing in screenshots.
 
-currentUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name :/ { print $3 }' ) 
+export PATH=/usr/bin:/bin:/usr/sbin:/sbin
 
-if [ -z "$currentUser" -o "$currentUser" = "loginwindow" ]; then 
-  echo "no user logged in, cannot proceed"  
-  exit 1  
-fi  
+set +e  # Don't exit on individual command failures
 
-uid=$(id -u "$currentUser") 
+echo "=== Dismissing macOS system dialogs ==="
 
-runAsUser() {   
-  if [ "$currentUser" != "loginwindow" ]; then 
-    launchctl asuser "$uid" sudo -u "$currentUser" "$@" 
-  else 
-    echo "no user logged in" 
-  fi 
-} 
+# 1. Kill Setup Assistant (shows "Sign In to Apple Account" dialog)
+if pgrep -x "Setup Assistant" > /dev/null 2>&1; then
+  echo "Found Setup Assistant running, terminating..."
+  killall "Setup Assistant" 2>/dev/null
+  echo "Setup Assistant terminated"
+else
+  echo "Setup Assistant not running"
+fi
 
-runAsUser launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist 
+# 2. Prevent Setup Assistant from reappearing
+defaults write com.apple.SetupAssistant DidSeeCloudSetup -bool true 2>/dev/null
+defaults write com.apple.SetupAssistant LastSeenCloudProductVersion -string "15.0" 2>/dev/null
+echo "Setup Assistant preferences updated"
+
+# 3. Enable Do Not Disturb to suppress notification banners
+#    Uses defaults write (works without elevated permissions, unlike launchctl unload)
+defaults write com.apple.ncprefs dnd_prefs -data 62706C6973743030D60102030405060708080A08085B646E644D6972726F7265645F100F646E64446973706C6179536C6565705F101E72657065617465644661636574696D6543616C6C73427265616B73444E445E646E64446973706C61794C6F636B5F10136661636574696D6543616E427265616B444E4409080808 2>/dev/null && echo "Do Not Disturb enabled" || echo "Do Not Disturb: defaults write not supported on this version"
+
+# 4. Suppress macOS onboarding tips and "What's new" banners (macOS 26 Tahoe+)
+#    These appear as notification banners (e.g., "See what's new in macOS Tahoe")
+#    and interfere with full-screen screenshot tests.
+defaults write com.apple.tipsd ShouldShowTips -bool false 2>/dev/null && echo "Tips disabled (tipsd)" || echo "Tips: defaults write not supported"
+defaults write com.apple.tipsd LastTipShownTimestamp -date "$(date -u +%Y-%m-%dT%H:%M:%SZ)" 2>/dev/null
+# Also suppress Tips via the Notification Center preferences
+defaults write com.apple.tips ShouldShowTips -bool false 2>/dev/null
+# Kill the tips daemon so changes take effect immediately
+if pgrep -x "tipsd" > /dev/null 2>&1; then
+  echo "Terminating tipsd..."
+  killall "tipsd" 2>/dev/null
+fi
+
+# 5. Also try killing any other system dialogs that might interfere
+for proc in "UserNotificationCenter" "CoreServicesUIAgent"; do
+  if pgrep -x "$proc" > /dev/null 2>&1; then
+    echo "Terminating $proc..."
+    killall "$proc" 2>/dev/null
+  fi
+done
+
+echo "=== System dialog suppression complete ==="
+exit 0

eng/scripts/enable-notification-center.sh

@@ -1,21 +1,20 @@
-#!/bin/sh 
-export PATH=/usr/bin:/bin:/usr/sbin:/sbin 
+#!/bin/sh
 
-currentUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name :/ { print $3 }' ) 
+# Re-enable macOS notifications after UI tests complete.
+# Counterpart to disable-notification-center.sh.
 
-if [ -z "$currentUser" -o "$currentUser" = "loginwindow" ]; then 
-  echo "no user logged in, cannot proceed" 
-  exit 1  
-fi 
+export PATH=/usr/bin:/bin:/usr/sbin:/sbin
 
-uid=$(id -u "$currentUser")  
+set +e
 
-runAsUser() {   
-  if [ "$currentUser" != "loginwindow" ]; then 
-    launchctl asuser "$uid" sudo -u "$currentUser" "$@" 
-  else 
-    echo "no user logged in" 
-  fi 
-} 
+echo "=== Re-enabling macOS notifications ==="
 
-runAsUser launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist 
+# Disable Do Not Disturb
+defaults delete com.apple.ncprefs dnd_prefs 2>/dev/null && echo "Do Not Disturb disabled" || echo "Do Not Disturb: already disabled or not supported"
+
+# Re-enable tips
+defaults delete com.apple.tipsd ShouldShowTips 2>/dev/null && echo "Tips re-enabled (tipsd)" || echo "Tips: already enabled or not supported"
+defaults delete com.apple.tips ShouldShowTips 2>/dev/null
+
+echo "=== Notifications re-enabled ==="
+exit 0

src/Controls/tests/TestCases.HostApp/Issues/Issue32416.cs

@@ -27,7 +27,8 @@ protected override void Init()
 		{
 			Items.Add(new MenuItem
 			{
-				Text = $"Item {i}"
+				Text = $"Item {i}",
+				AutomationId = $"Item {i}"
 			});
 		}
 	}

src/Controls/tests/TestCases.HostApp/Issues/Issue32477.cs

@@ -27,7 +27,8 @@ protected override void Init()
 		{
 			Items.Add(new MenuItem
 			{
-				Text = $"Item {i}"
+				Text = $"Item {i}",
+				AutomationId = $"Item {i}"
 			});
 		}
 	}

src/Controls/tests/TestCases.HostApp/MauiProgram.cs

@@ -125,6 +125,12 @@ class App : Application
 
 		public App()
 		{
+#if MACCATALYST
+			// Force light mode for consistent screenshots on macOS 26+
+			// where CI VMs default to dark mode. Info.plist UIUserInterfaceStyle
+			// is not respected by Mac Catalyst on macOS 26.
+			UserAppTheme = AppTheme.Light;
+#endif
 		}
 
 		public static bool PreloadTestCasesIssuesList { get; set; } = true;