fix #582, allow disabling duplicate contact merging

app/src/main/kotlin/com/simplemobiletools/contacts/pro/activities/SettingsActivity.kt

@@ -34,6 +34,7 @@ class SettingsActivity : SimpleActivity() {
         setupShowPhoneNumbers()
         setupShowContactsWithNumbers()
         setupStartNameWithSurname()
+        setupMergeDuplicateContacts()
         setupShowCallConfirmation()
         setupShowDialpadButton()
         setupShowPrivateContacts()
@@ -216,4 +217,12 @@ class SettingsActivity : SimpleActivity() {
             config.showCallConfirmation = settings_show_call_confirmation.isChecked
         }
     }
+
+    private fun setupMergeDuplicateContacts() {
+        settings_merge_duplicate_contacts.isChecked = config.mergeDuplicateContacts
+        settings_merge_duplicate_contacts_holder.setOnClickListener {
+            settings_merge_duplicate_contacts.toggle()
+            config.mergeDuplicateContacts = settings_merge_duplicate_contacts.isChecked
+        }
+    }
 }

app/src/main/kotlin/com/simplemobiletools/contacts/pro/activities/ViewContactActivity.kt

@@ -245,9 +245,11 @@ class ViewContactActivity : ContactActivity() {
             contactSources = it
             runOnUiThread {
                 setupContactDetails()
-                getDuplicateContacts {
-                    if (duplicateContacts.isNotEmpty()) {
-                        setupContactDetails()
+                if (config.mergeDuplicateContacts) {
+                    getDuplicateContacts {
+                        if (duplicateContacts.isNotEmpty()) {
+                            setupContactDetails()
+                        }
                     }
                 }
             }

app/src/main/kotlin/com/simplemobiletools/contacts/pro/helpers/Config.kt

@@ -33,8 +33,10 @@ class Config(context: Context) : BaseConfig(context) {
         set(onContactClick) = prefs.edit().putInt(ON_CONTACT_CLICK, onContactClick).apply()
 
     var showContactFields: Int
-        get() = prefs.getInt(SHOW_CONTACT_FIELDS, SHOW_FIRST_NAME_FIELD or SHOW_SURNAME_FIELD or SHOW_PHONE_NUMBERS_FIELD or SHOW_EMAILS_FIELD or
-                SHOW_ADDRESSES_FIELD or SHOW_EVENTS_FIELD or SHOW_NOTES_FIELD or SHOW_GROUPS_FIELD or SHOW_CONTACT_SOURCE_FIELD)
+        get() = prefs.getInt(
+            SHOW_CONTACT_FIELDS, SHOW_FIRST_NAME_FIELD or SHOW_SURNAME_FIELD or SHOW_PHONE_NUMBERS_FIELD or SHOW_EMAILS_FIELD or
+                SHOW_ADDRESSES_FIELD or SHOW_EVENTS_FIELD or SHOW_NOTES_FIELD or SHOW_GROUPS_FIELD or SHOW_CONTACT_SOURCE_FIELD
+        )
         set(showContactFields) = prefs.edit().putInt(SHOW_CONTACT_FIELDS, showContactFields).apply()
 
     var showTabs: Int
@@ -60,4 +62,8 @@ class Config(context: Context) : BaseConfig(context) {
     var showPrivateContacts: Boolean
         get() = prefs.getBoolean(SHOW_PRIVATE_CONTACTS, true)
         set(showPrivateContacts) = prefs.edit().putBoolean(SHOW_PRIVATE_CONTACTS, showPrivateContacts).apply()
+
+    var mergeDuplicateContacts: Boolean
+        get() = prefs.getBoolean(MERGE_DUPLICATE_CONTACTS, true)
+        set(mergeDuplicateContacts) = prefs.edit().putBoolean(MERGE_DUPLICATE_CONTACTS, mergeDuplicateContacts).apply()
 }

app/src/main/kotlin/com/simplemobiletools/contacts/pro/helpers/Constants.kt

@@ -21,6 +21,7 @@ const val SPEED_DIAL = "speed_dial"
 const val LAST_EXPORT_PATH = "last_export_path"
 const val WAS_LOCAL_ACCOUNT_INITIALIZED = "was_local_account_initialized"
 const val SHOW_PRIVATE_CONTACTS = "show_private_contacts"
+const val MERGE_DUPLICATE_CONTACTS = "merge_duplicate_contacts"
 
 const val SMT_PRIVATE = "smt_private"   // used at the contact source of local contacts hidden from other apps
 const val GROUP = "group"

app/src/main/kotlin/com/simplemobiletools/contacts/pro/helpers/ContactsHelper.kt

@@ -72,7 +72,7 @@ class ContactsHelper(val context: Context) {
                 contacts.valueAt(it)
             }
 
-            if (ignoredContactSources.isEmpty() && !getAll) {
+            if (context.config.mergeDuplicateContacts && ignoredContactSources.isEmpty() && !getAll) {
                 tempContacts.filter { displayContactSources.contains(it.source) }.groupBy { it.getNameToDisplay().toLowerCase() }.values.forEach { it ->
                     if (it.size == 1) {
                         resultContacts.add(it.first())

app/src/main/res/layout/activity_settings.xml

@@ -114,6 +114,22 @@
 
             </RelativeLayout>
 
+            <RelativeLayout
+                android:id="@+id/settings_merge_duplicate_contacts_holder"
+                style="@style/SettingsHolderCheckboxStyle"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@drawable/ripple_background">
+
+                <com.simplemobiletools.commons.views.MyAppCompatCheckbox
+                    android:id="@+id/settings_merge_duplicate_contacts"
+                    style="@style/SettingsCheckboxStyle"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:text="@string/merge_duplicate_contacts" />
+
+            </RelativeLayout>
+
             <RelativeLayout
                 android:id="@+id/settings_show_call_confirmation_holder"
                 style="@style/SettingsHolderCheckboxStyle"