Fix RTL bug on wrongly retained currentItem

Author: cortinico

appintro/src/main/java/com/github/appintro/AppIntroBase.kt

@@ -486,7 +486,13 @@ abstract class AppIntroBase : AppCompatActivity(), AppIntroViewPagerListener {
             putBoolean(ARG_BUNDLE_IS_SKIP_BUTTON_ENABLED, isSkipButtonEnabled)
             putBoolean(ARG_BUNDLE_IS_INDICATOR_ENABLED, isIndicatorEnabled)
 
-            putInt(ARG_BUNDLE_CURRENT_ITEM, pager.currentItem)
+            // We can't use pager.currentItem as we need the current item that is RTL-invariant.
+            val currentItem = if (isRtl) {
+                fragments.size - pager.currentItem
+            } else {
+                pager.currentItem
+            }
+            putInt(ARG_BUNDLE_CURRENT_ITEM, currentItem)
             putBoolean(ARG_BUNDLE_IS_FULL_PAGING_ENABLED, pager.isFullPagingEnabled)
 
             putSerializable(ARG_BUNDLE_PERMISSION_MAP, permissionsMap)

example/src/main/res/layout/item_intro.xml

@@ -15,11 +15,14 @@
 
         <TextView
             android:id="@+id/item_title"
-            android:layout_width="match_parent"
+            android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
+            android:layout_marginEnd="@dimen/base_grid_size"
+            android:layout_marginRight="@dimen/base_grid_size"
             android:textAppearance="@style/TextAppearance.AppCompat.Title"
-            app:layout_constraintEnd_toStartOf="parent"
+            app:layout_constraintEnd_toStartOf="@id/item_button"
+            app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
             tools:text="AppIntro Sample App" />