option to disable conversation thread view

FlowCrypt/src/main/java/com/flowcrypt/email/Constants.kt

@@ -63,6 +63,7 @@ class Constants {
     const val PREF_KEY_INSTALL_VERSION = "pref_key_install_version"
     const val PREF_KEY_SERVER_SETTINGS = "pref_key_server_settings"
     const val PREF_KEY_GENERAL = "pref_key_general"
+    const val PREF_KEY_ATTACHMENTS_CATEGORY = "pref_key_attachments_category"
 
     /**
      * The max total size off all attachment which can be send via the app.

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/fragment/MainSettingsFragment.kt

@@ -115,13 +115,11 @@ class MainSettingsFragment : BasePreferenceFragment() {
   override fun onAccountInfoRefreshed(accountEntity: AccountEntity?) {
     super.onAccountInfoRefreshed(accountEntity)
     findPreference<Preference>(Constants.PREF_KEY_BACKUPS)?.isVisible =
-      !(accountEntity?.hasClientConfigurationProperty(ClientConfiguration.ConfigurationProperty.NO_PRV_BACKUP)
-        ?: false)
+      accountEntity?.hasClientConfigurationProperty(
+        ClientConfiguration.ConfigurationProperty.NO_PRV_BACKUP
+      ) != true
 
     findPreference<Preference>(Constants.PREF_KEY_SERVER_SETTINGS)?.isVisible =
       accountEntity?.useAPI == false
-
-    findPreference<Preference>(Constants.PREF_KEY_GENERAL)?.isVisible =
-      accountEntity?.isHandlingAttachmentRestricted() == false
   }
 }

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/fragment/preferences/GeneralSettingsFragment.kt

@@ -7,7 +7,10 @@ package com.flowcrypt.email.ui.activity.fragment.preferences
 
 import android.os.Bundle
 import android.view.View
+import androidx.preference.Preference
+import com.flowcrypt.email.Constants
 import com.flowcrypt.email.R
+import com.flowcrypt.email.database.entity.AccountEntity
 import com.flowcrypt.email.extensions.androidx.fragment.app.supportActionBar
 import com.flowcrypt.email.ui.activity.fragment.base.BasePreferenceFragment
 
@@ -25,4 +28,10 @@ open class GeneralSettingsFragment : BasePreferenceFragment() {
   override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
     setPreferencesFromResource(R.xml.preferences_general_settings, rootKey)
   }
+
+  override fun onAccountInfoRefreshed(accountEntity: AccountEntity?) {
+    super.onAccountInfoRefreshed(accountEntity)
+    findPreference<Preference>(Constants.PREF_KEY_ATTACHMENTS_CATEGORY)?.isVisible =
+      accountEntity?.isHandlingAttachmentRestricted() == false
+  }
 }

FlowCrypt/src/main/res/values-ru/strings.xml

@@ -647,6 +647,8 @@
     <string name="general">Общиe</string>
     <string name="disable_smart_mode_for_attachments_preview">Отключить интеллектуальный режим для предварительного просмотра вложений</string>
     <string name="message_not_found_please_reload_the_thread">Сообщение не найдено. Похоже, оно было перемещено или удалено. Пожалуйста, перезагрузите переписку, чтобы получить последние обновления.</string>
+    <string name="conversation">Conversation</string>
+    <string name="conversation_view">Conversation view</string>
     <plurals name="drafts_count">
         <item quantity="one" tools:ignore="ImpliedQuantity">Черновик</item>
         <item quantity="few">Черновики(%1$d)</item>

FlowCrypt/src/main/res/values-uk/strings.xml

@@ -648,6 +648,8 @@
     <string name="general">Загальні</string>
     <string name="disable_smart_mode_for_attachments_preview">Вимкнути розумний режим для попереднього перегляду вкладень</string>
     <string name="message_not_found_please_reload_the_thread">Повідомлення не знайдено. Схоже, його перемістили або видалили. Оновіть бесіду, щоб отримати останні оновлення.</string>
+    <string name="conversation">Conversation</string>
+    <string name="conversation_view">Conversation view</string>
     <plurals name="drafts_count">
         <item quantity="one" tools:ignore="ImpliedQuantity">Чорновик</item>
         <item quantity="few">Чорновики(%1$d)</item>

FlowCrypt/src/main/res/values/preferences.xml

@@ -8,6 +8,8 @@
     <string name="preferences_key_manage_notifications" translatable="false">preferences_key_manage_notifications</string>
     <string name="preferences_key_security_change_pass_phrase" translatable="false">preferences_key_security_change_pass_phrase</string>
     <string name="preferences_key_attachments_disable_smart_mode_for_preview" translatable="false">preferences_key_attachments_disable_smart_mode_for_preview</string>
+    <string name="preferences_key_attachments_category" translatable="false">preferences_key_attachments_category</string>
+    <string name="preferences_key_conversation_view" translatable="false">preferences_key_conversation_view</string>
     <string name="pref_key_backups" translatable="false">pref_key_backups</string>
     <string name="pref_key_general" translatable="false">pref_key_general</string>
     <string name="pref_key_server_settings" translatable="false">pref_key_server_settings</string>

FlowCrypt/src/main/res/values/strings.xml

@@ -657,6 +657,8 @@
     <string name="general">General</string>
     <string name="disable_smart_mode_for_attachments_preview">Disable smart mode for attachments preview</string>
     <string name="message_not_found_please_reload_the_thread">Message not found. It looks like it was moved or deleted. Please reload the thread to get the latest updates.</string>
+    <string name="conversation">Conversation</string>
+    <string name="conversation_view">Conversation view</string>
     <plurals name="drafts_count">
         <item quantity="one">Draft</item>
         <item quantity="other">Drafts(%1$d)</item>

FlowCrypt/src/main/res/xml/preferences_general_settings.xml

@@ -7,7 +7,23 @@
 
     <PreferenceCategory
         app:iconSpaceReserved="false"
-        app:key="attachments_category"
+        app:key="conversation"
+        app:title="@string/conversation">
+
+        <SwitchPreference
+            app:defaultValue="true"
+            app:iconSpaceReserved="false"
+            app:key="@string/preferences_key_conversation_view"
+            app:summaryOff="@string/pref_summary_disabled"
+            app:summaryOn="@string/pref_summary_enabled"
+            app:title="@string/conversation_view" />
+
+    </PreferenceCategory>
+
+    <PreferenceCategory
+        app:iconSpaceReserved="false"
+        app:isPreferenceVisible="false"
+        app:key="@string/preferences_key_attachments_category"
         app:title="@string/attachments">
 
         <SwitchPreference

FlowCrypt/src/main/res/xml/preferences_main_settings.xml

@@ -54,8 +54,7 @@
     <Preference
         android:key="@string/pref_key_general"
         android:title="@string/general"
-        app:iconSpaceReserved="false"
-        app:isPreferenceVisible="false" />
+        app:iconSpaceReserved="false" />
 
     <Preference
         android:key="@string/pref_key_experimental"