Don't apply default options in mergeOptions

lib/android/app/src/main/java/com/reactnativenavigation/parse/TopBarOptions.java

         validate();
     }
 
-    private void validate() {
+    public void validate() {
         if (title.component.hasValue() && (title.text.hasValue() || subtitle.text.hasValue())) {
             if (BuildConfig.DEBUG) Log.w("RNN", "A screen can't use both text and component - clearing text.");
             title.text = new NullText();

lib/android/app/src/main/java/com/reactnativenavigation/presentation/BottomTabsOptionsPresenter.java

     }
 
     public void mergeChildOptions(Options options, Component child) {
-        Options withDefault = options.copy().withDefaultOptions(defaultOptions);
-        mergeBottomTabsOptions(withDefault.bottomTabsOptions, withDefault.animations);
+        mergeBottomTabsOptions(options.bottomTabsOptions, options.animations);
         int tabIndex = bottomTabFinder.findByComponent(child);
-        mergeDrawBehind(withDefault.bottomTabsOptions, tabIndex);
+        mergeDrawBehind(options.bottomTabsOptions, tabIndex);
     }
 
     private void mergeBottomTabsOptions(BottomTabsOptions options, AnimationsOptions animations) {

lib/android/app/src/main/java/com/reactnativenavigation/presentation/StackOptionsPresenter.java

     }
 
     public void mergeChildOptions(Options options, Component child) {
-        Options withDefaultOptions = options.copy().withDefaultOptions(defaultOptions);
-        mergeOrientation(withDefaultOptions.layout.orientation);
-        mergeButtons(withDefaultOptions.topBar.buttons);
-        mergeTopBarOptions(withDefaultOptions.topBar, withDefaultOptions.animations, child);
-        mergeTopTabsOptions(withDefaultOptions.topTabs);
-        mergeTopTabOptions(withDefaultOptions.topTabOptions);
+        mergeOrientation(options.layout.orientation);
+        mergeButtons(options.topBar.buttons);
+        mergeTopBarOptions(options.topBar, options.animations, child);
+        mergeTopTabsOptions(options.topTabs);
+        mergeTopTabOptions(options.topTabOptions);
     }
 
     private void mergeOrientation(OrientationOptions orientationOptions) {

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/BottomTabsOptionsPresenterTest.java

+package com.reactnativenavigation.viewcontrollers;
+
+import android.app.Activity;
+
+import com.reactnativenavigation.BaseTest;
+import com.reactnativenavigation.mocks.SimpleViewController;
+import com.reactnativenavigation.parse.Options;
+import com.reactnativenavigation.parse.params.Bool;
+import com.reactnativenavigation.parse.params.Color;
+import com.reactnativenavigation.presentation.BottomTabsOptionsPresenter;
+import com.reactnativenavigation.viewcontrollers.bottomtabs.TabSelector;
+import com.reactnativenavigation.views.BottomTabs;
+import com.reactnativenavigation.views.Component;
+
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+public class BottomTabsOptionsPresenterTest extends BaseTest {
+    private List<ViewController> tabs;
+    private BottomTabsOptionsPresenter uut;
+    private BottomTabs bottomTabs;
+
+    @Override
+    public void beforeEach() {
+        Activity activity = newActivity();
+        ChildControllersRegistry childRegistry = new ChildControllersRegistry();
+        ViewController child1 = spy(new SimpleViewController(activity, childRegistry, "child1", new Options()));
+        ViewController child2 = spy(new SimpleViewController(activity, childRegistry, "child2", new Options()));
+        tabs = Arrays.asList(child1, child2);
+        uut = new BottomTabsOptionsPresenter(tabs, new Options());
+        bottomTabs = Mockito.mock(BottomTabs.class);
+        uut.bindView(bottomTabs, Mockito.mock(TabSelector.class));
+    }
+
+    @Test
+    public void mergeChildOptions_onlyDeclaredOptionsAreApplied() { // default options are not applies on merge
+        Options defaultOptions = new Options();
+        defaultOptions.bottomTabsOptions.visible = new Bool(false);
+        uut.setDefaultOptions(defaultOptions);
+
+        Options options = new Options();
+        options.bottomTabsOptions.backgroundColor = new Color(10);
+        uut.mergeChildOptions(options, (Component) tabs.get(0).getView());
+        verify(bottomTabs).setBackgroundColor(options.bottomTabsOptions.backgroundColor.get());
+        verifyNoMoreInteractions(bottomTabs);
+    }
+}

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/StackOptionsPresenterTest.java

         options.topBar.visible = new Bool(false);
         options.topBar.drawBehind = new Bool(false);
         options.topBar.hideOnScroll = new Bool(false);
+        options.topBar.validate();
         uut.mergeChildOptions(options, child);
 
         assertTopBarOptions(options, 1);
         verify(topBar).hide();
     }
 
+    @Test
+    public void mergeOptions_defaultOptionsAreNotApplied() {
+        Options defaultOptions = new Options();
+        defaultOptions.topBar.background.color = new Color(10);
+        uut.setDefaultOptions(defaultOptions);
+
+        Options childOptions = new Options();
+        childOptions.topBar.title.text = new Text("someText");
+        uut.mergeChildOptions(childOptions, child);
+
+        verify(topBar, times(0)).setBackgroundColor(anyInt());
+    }
+
     private void assertTopBarOptions(Options options, int t) {
         if (options.topBar.title.component.hasValue()) {
             verify(topBar, times(0)).setTitle(any());