Remove mentions of "gesture" on the Accessibility Button settings page

Configures page to hide/replace elements that would mention gesture.
Also, provides context when necessary if a setting is disabled by the current button mode.

Demonstration video:
https://x20web.corp.google.com/users/jo/jonesriley/splitShortcut/a11yShortcutSettingsCleanup.mp4

Test: manual, navigate to the Accessibility Button "more options" page in gesture navigation mode. Verify there are no references to gesture.
Bug: 349178639
Flag: android.provider.a11y_standalone_gesture_enabled
Change-Id: I067738d23e74c00bab4010d187820d09013809ad

res/values/strings.xml

@@ -5176,6 +5176,8 @@
     <string name="accessibility_button_low_label">Transparent</string>
     <!-- Label on the right side of transparency adjustment slider [CHAR LIMIT=30] -->
     <string name="accessibility_button_high_label">Non-transparent</string>
+    <!-- Summary for settings that are disabled in the current button mode [CHAR LIMIT=30] -->
+    <string name="accessibility_button_disabled_button_mode_summary">Unavailable while using navigation bar button mode.</string>
     <!-- Title for the accessibility preference to high contrast text. [CHAR LIMIT=35] -->
     <string name="accessibility_toggle_high_text_contrast_preference_title">High contrast text</string>
     <!-- Summary for the accessibility preference to high contrast text. [CHAR LIMIT=NONE] -->

src/com/android/settings/accessibility/AccessibilityButtonFragment.java

@@ -33,8 +33,15 @@ public class AccessibilityButtonFragment extends DashboardFragment {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        final int titleResource = AccessibilityUtil.isGestureNavigateEnabled(getPrefContext())
+
-                ? R.string.accessibility_button_gesture_title : R.string.accessibility_button_title;
+        final int titleResource;
+        if (android.provider.Flags.a11yStandaloneGestureEnabled()) {
+            titleResource = R.string.accessibility_button_title;
+        } else {
+            titleResource = AccessibilityUtil.isGestureNavigateEnabled(getPrefContext())
+                    ? R.string.accessibility_button_gesture_title
+                    : R.string.accessibility_button_title;
+        }
         getActivity().setTitle(titleResource);
     }
 

src/com/android/settings/accessibility/AccessibilityButtonGesturePreferenceController.java

@@ -50,8 +50,12 @@ public class AccessibilityButtonGesturePreferenceController extends BasePreferen
 
     @Override
     public int getAvailabilityStatus() {
-        return AccessibilityUtil.isGestureNavigateEnabled(mContext)
+        if (android.provider.Flags.a11yStandaloneGestureEnabled()) {
-                ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+            return CONDITIONALLY_UNAVAILABLE;
+        } else {
+            return AccessibilityUtil.isGestureNavigateEnabled(mContext)
+                    ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+        }
     }
 
     @Override

src/com/android/settings/accessibility/FloatingMenuFadePreferenceController.java

@@ -28,6 +28,7 @@ import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 import androidx.preference.TwoStatePreference;
 
+import com.android.settings.R;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
@@ -64,6 +65,18 @@ public class FloatingMenuFadePreferenceController extends BasePreferenceControll
                 ? AVAILABLE : DISABLED_DEPENDENT_SETTING;
     }
 
+    @Override
+    public CharSequence getSummary() {
+        if (mPreference != null) {
+            return mPreference.isEnabled()
+                    ? "%s"
+                    : mContext.getString(
+                            R.string.accessibility_button_disabled_button_mode_summary);
+        } else {
+            return "%s";
+        }
+    }
+
     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
@@ -101,6 +114,7 @@ public class FloatingMenuFadePreferenceController extends BasePreferenceControll
 
     private void updateAvailabilityStatus() {
         mPreference.setEnabled(AccessibilityUtil.isFloatingMenuEnabled(mContext));
+        refreshSummary(mPreference);
     }
 
     private int getFloatingMenuFadeValue() {

src/com/android/settings/accessibility/FloatingMenuSizePreferenceController.java

@@ -29,6 +29,7 @@ import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 
+import com.android.settings.R;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
@@ -79,6 +80,18 @@ public class FloatingMenuSizePreferenceController extends BasePreferenceControll
                 ? AVAILABLE : DISABLED_DEPENDENT_SETTING;
     }
 
+    @Override
+    public CharSequence getSummary() {
+        if (mPreference != null) {
+            return mPreference.isEnabled()
+                    ? "%s"
+                    : mContext.getString(
+                            R.string.accessibility_button_disabled_button_mode_summary);
+        } else {
+            return "%s";
+        }
+    }
+
     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
@@ -119,6 +132,7 @@ public class FloatingMenuSizePreferenceController extends BasePreferenceControll
 
     private void updateAvailabilityStatus() {
         mPreference.setEnabled(AccessibilityUtil.isFloatingMenuEnabled(mContext));
+        refreshSummary(mPreference);
     }
 
     @Size