Made following changes to Settings:

- Moved the Voice Input setting from Digital assistant app to Languages & input.
- Bundled Voice Input and Text-to-speech settings together under Speech
  category.

Bug: 218609449

Test: refactoring CL. Existing unit tests still pass.
Change-Id: I3107a410ed35685f5f1081cbe448b105b5c79c24

res/xml/language_and_input.xml

@@ -38,8 +38,6 @@
                 android:name="classname"
                 android:value="com.android.settings.applications.appinfo.AppLocaleDetails" />
         </Preference>
-
-
     </PreferenceCategory>
 
     <PreferenceCategory
@@ -50,6 +48,7 @@
             android:title="@string/virtual_keyboard_category"
             android:fragment="com.android.settings.inputmethod.AvailableVirtualKeyboardFragment"
             settings:keywords="@string/keywords_virtual_keyboard"/>
+
         <Preference
             android:key="physical_keyboard_pref"
             android:title="@string/physical_keyboard_title"
@@ -57,6 +56,21 @@
             android:fragment="com.android.settings.inputmethod.PhysicalKeyboardFragment"/>
     </PreferenceCategory>
 
+    <PreferenceCategory
+        android:key="speech_category"
+        android:title="@string/speech_category_title">
+        <com.android.settings.widget.GearPreference
+            android:key="voice_input_settings"
+            android:title="@string/voice_input_settings_title"
+            android:fragment="com.android.settings.language.DefaultVoiceInputPicker" />
+
+        <Preference
+            android:key="tts_settings_summary"
+            android:title="@string/tts_settings_title"
+            android:fragment="com.android.settings.tts.TextToSpeechSettings"
+            settings:searchable="false"/>
+    </PreferenceCategory>
+
     <PreferenceCategory
         android:key="input_assistance_category"
         android:title="@string/input_assistance">
@@ -79,20 +93,12 @@
     </PreferenceCategory>
 
     <PreferenceCategory
-        android:key="pointer_and_tts_category"
+        android:key="pointer_category"
         android:layout="@layout/preference_category_no_label">
-
         <com.android.settings.PointerSpeedPreference
             android:key="pointer_speed"
             android:title="@string/pointer_speed"
             android:dialogTitle="@string/pointer_speed" />
-
-        <Preference
-            android:key="tts_settings_summary"
-            android:title="@string/tts_settings_title"
-            android:fragment="com.android.settings.tts.TextToSpeechSettings"
-            settings:searchable="false"/>
-
     </PreferenceCategory>
 
     <SwitchPreference

res/xml/manage_assist.xml

@@ -49,11 +49,6 @@
         android:title="@string/assist_flash_title"
         android:summary="@string/assist_flash_summary" />
 
-    <com.android.settings.widget.GearPreference
-        android:key="voice_input_settings"
-        android:title="@string/voice_input_settings_title"
-        android:fragment="com.android.settings.applications.assist.DefaultVoiceInputPicker" />
-
     <com.android.settingslib.widget.FooterPreference
         android:key="manage_assist_footer"
         android:title="@string/assist_footer"