Set and unset accessibility flags even when re-entrant (#6853)

* Make sure to not unset a11y flags on reentrant calls to API

shell/platform/android/io/flutter/view/FlutterView.java

@@ -877,7 +877,9 @@ public class FlutterView extends SurfaceView
             ensureAccessibilityEnabled();
         }
         if (mTouchExplorationEnabled) {
-            mAccessibilityFeatureFlags ^= AccessibilityFeature.ACCESSIBLE_NAVIGATION.value;
+            mAccessibilityFeatureFlags |= AccessibilityFeature.ACCESSIBLE_NAVIGATION.value;
+        } else {
+            mAccessibilityFeatureFlags &= ~AccessibilityFeature.ACCESSIBLE_NAVIGATION.value;
         }
         // Apply additional accessibility settings
         updateAccessibilityFeatures();
@@ -896,7 +898,7 @@ public class FlutterView extends SurfaceView
             String transitionAnimationScale = Settings.Global.getString(getContext().getContentResolver(),
                 Settings.Global.TRANSITION_ANIMATION_SCALE);
             if (transitionAnimationScale != null && transitionAnimationScale.equals("0")) {
-                mAccessibilityFeatureFlags ^= AccessibilityFeature.DISABLE_ANIMATIONS.value;
+                mAccessibilityFeatureFlags |= AccessibilityFeature.DISABLE_ANIMATIONS.value;
             } else {
                 mAccessibilityFeatureFlags &= ~AccessibilityFeature.DISABLE_ANIMATIONS.value;
             }
@@ -966,7 +968,7 @@ public class FlutterView extends SurfaceView
             String value = Settings.Global.getString(getContext().getContentResolver(),
                     Settings.Global.TRANSITION_ANIMATION_SCALE);
             if (value != null && value.equals("0")) {
-                mAccessibilityFeatureFlags ^= AccessibilityFeature.DISABLE_ANIMATIONS.value;
+                mAccessibilityFeatureFlags |= AccessibilityFeature.DISABLE_ANIMATIONS.value;
             } else {
                 mAccessibilityFeatureFlags &= ~AccessibilityFeature.DISABLE_ANIMATIONS.value;
             }
@@ -980,7 +982,7 @@ public class FlutterView extends SurfaceView
             if (enabled) {
                 mTouchExplorationEnabled = true;
                 ensureAccessibilityEnabled();
-                mAccessibilityFeatureFlags ^= AccessibilityFeature.ACCESSIBLE_NAVIGATION.value;
+                mAccessibilityFeatureFlags |= AccessibilityFeature.ACCESSIBLE_NAVIGATION.value;
                 nativeSetAccessibilityFeatures(mNativeView.get(), mAccessibilityFeatureFlags);
             } else {
                 mTouchExplorationEnabled = false;

shell/platform/darwin/ios/framework/Source/FlutterViewController.mm

@@ -716,11 +716,11 @@ static blink::PointerData::DeviceKind DeviceKindFromTouchType(UITouch* touch) {
   auto platformView = [_engine.get() platformView];
   int32_t flags = 0;
   if (UIAccessibilityIsInvertColorsEnabled())
-    flags ^= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kInvertColors);
+    flags |= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kInvertColors);
   if (UIAccessibilityIsReduceMotionEnabled())
-    flags ^= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kReduceMotion);
+    flags |= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kReduceMotion);
   if (UIAccessibilityIsBoldTextEnabled())
-    flags ^= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kBoldText);
+    flags |= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kBoldText);
 #if TARGET_OS_SIMULATOR
   // There doesn't appear to be any way to determine whether the accessibility
   // inspector is enabled on the simulator. We conservatively always turn on the
@@ -729,8 +729,8 @@ static blink::PointerData::DeviceKind DeviceKindFromTouchType(UITouch* touch) {
   platformView->SetAccessibilityFeatures(flags);
 #else
   bool enabled = UIAccessibilityIsVoiceOverRunning() || UIAccessibilityIsSwitchControlRunning();
-  if (UIAccessibilityIsVoiceOverRunning() || UIAccessibilityIsSwitchControlRunning())
-    flags ^= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kAccessibleNavigation);
+  if (enabled)
+    flags |= static_cast<int32_t>(blink::AccessibilityFeatureFlag::kAccessibleNavigation);
   platformView->SetSemanticsEnabled(enabled || UIAccessibilityIsSpeakScreenEnabled());
   platformView->SetAccessibilityFeatures(flags);
 #endif