more code review fixes

Author: sspanak

app/src/main/java/io/github/sspanak/tt9/ime/UiHandler.java

@@ -62,7 +62,7 @@ public boolean onEvaluateFullscreenMode() {
 	@Override
 	protected void onInit() {
 		if (foldDetector == null) {
-			foldDetector = new FoldDetector(this, () -> settings.setFolded(foldDetector.isFolded()));
+			foldDetector = new FoldDetector(this, () -> settings.setFolded(foldDetector == null || foldDetector.isFolded()));
 		}
 
 		if (mainView == null) {

app/src/main/java/io/github/sspanak/tt9/preferences/screens/appearance/AppearanceScreen.java

@@ -2,6 +2,7 @@
 
 import androidx.annotation.Nullable;
 import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
 import androidx.preference.SwitchPreferenceCompat;
 
 import io.github.sspanak.tt9.R;
@@ -25,6 +26,7 @@ public class AppearanceScreen extends ScreenWithPreviewKeyboardHeaderFragment {
 	protected void onCreate() {
 		super.onCreate();
 		createMainSection();
+		createUnfoldedAppearanceSection();
 		createHacksSection();
 		enablePreviewOnChange();
 		resetFontSize(true);
@@ -46,11 +48,6 @@ protected void createMainSection() {
 			return;
 		}
 
-		UnfoldedAppearanceLink unfoldedLink = findPreference(UnfoldedAppearanceLink.NAME);
-		if (unfoldedLink != null) {
-			unfoldedLink.populate(activity);
-		}
-
 		(new ItemStatusIcon(findPreference(ItemStatusIcon.NAME), activity.getSettings())).populate();
 		(new ItemSuggestionSmoothScroll(findPreference(ItemSuggestionSmoothScroll.NAME), activity.getSettings())).populate();
 
@@ -133,6 +130,24 @@ protected void createMainSection() {
 	}
 
 
+	private void createUnfoldedAppearanceSection() {
+		if (activity == null) {
+			return;
+		}
+
+
+		UnfoldedAppearanceLink unfoldedLink = findPreference(UnfoldedAppearanceLink.NAME);
+		if (unfoldedLink != null) {
+			unfoldedLink.populate(activity);
+		}
+
+		PreferenceCategory category = findPreference("category_unfolded_appearance");
+		if (category != null) {
+			category.setVisible(unfoldedLink != null && unfoldedLink.isVisible());
+		}
+	}
+
+
 	private void createHacksSection() {
 		if (activity == null) {
 			return;

app/src/main/res/xml/prefs_screen_appearance.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto" app:orderingFromXml="true">
-	<PreferenceCategory app:title="@string/pref_category_unfolded_appearance">
+	<PreferenceCategory app:key="category_unfolded_appearance" app:title="@string/pref_category_unfolded_appearance">
 		<io.github.sspanak.tt9.preferences.screens.appearance.UnfoldedAppearanceLink />
 	</PreferenceCategory>