Updated search suggestions on change search only

app/src/main/java/eu/faircode/email/SearchViewEx.java

@@ -49,6 +49,9 @@ public class SearchViewEx extends SearchView {
         setOnQueryTextListener(new SearchView.OnQueryTextListener() {
             @Override
             public boolean onQueryTextChange(String newText) {
+                if (newText.equals(_searching))
+                    return true;
+
                 _searching = newText;
                 intf.onSave(_searching);