Adding a long press icon description for the Search icon

Fixes #7836

res/values/strings.xml

@@ -669,6 +669,7 @@
 
     <!-- SearchToolbar -->
     <string name="SearchToolbar_search">Search</string>
+    <string name="SearchToolbar_search_for_conversations_contacts_and_messages">Search for conversations, contacts, and messages</string>
 
     <!-- SingleRecipientNotificationBuilder -->
     <string name="SingleRecipientNotificationBuilder_signal">Signal</string>

src/org/thoughtcrime/securesms/ConversationListActivity.java

@@ -25,6 +25,7 @@ import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.v7.widget.Toolbar;
+import android.support.v7.widget.TooltipCompat;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -87,6 +88,8 @@ public class ConversationListActivity extends PassphraseRequiredActionBarActivit
 
     RatingManager.showRatingDialogIfNecessary(this);
     RegistrationLockDialog.showReminderIfNecessary(this);
+
+    TooltipCompat.setTooltipText(searchAction, getText(R.string.SearchToolbar_search_for_conversations_contacts_and_messages));
   }
 
   @Override