Address code review comments

Author: Isira-Seneviratne

app/src/main/java/org/schabi/newpipe/MainActivity.java

@@ -553,28 +553,27 @@ public void onBackPressed() {
         // In case bottomSheet is not visible on the screen or collapsed we can assume that the user
         // interacts with a fragment inside fragment_holder so all back presses should be
         // handled by it
+        final var fragmentManager = getSupportFragmentManager();
+
         if (bottomSheetHiddenOrCollapsed()) {
-            final var fm = getSupportFragmentManager();
-            final var fragment = fm.findFragmentById(R.id.fragment_holder);
+            final var fragment = fragmentManager.findFragmentById(R.id.fragment_holder);
             // If current fragment implements BackPressable (i.e. can/wanna handle back press)
             // delegate the back press to it
             if (fragment instanceof BackPressable backPressable && backPressable.onBackPressed()) {
                 return;
             }
         } else {
-            final var fragmentPlayer = getSupportFragmentManager()
-                    .findFragmentById(R.id.fragment_player_holder);
+            final var player = fragmentManager.findFragmentById(R.id.fragment_player_holder);
             // If current fragment implements BackPressable (i.e. can/wanna handle back press)
             // delegate the back press to it
-            if (fragmentPlayer instanceof BackPressable backPressable
-                    && !backPressable.onBackPressed()) {
+            if (player instanceof BackPressable backPressable && !backPressable.onBackPressed()) {
                 BottomSheetBehavior.from(mainBinding.fragmentPlayerHolder)
                         .setState(BottomSheetBehavior.STATE_COLLAPSED);
                 return;
             }
         }
 
-        if (getSupportFragmentManager().getBackStackEntryCount() == 1) {
+        if (fragmentManager.getBackStackEntryCount() == 1) {
             finish();
         } else {
             super.onBackPressed();

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -73,7 +73,6 @@
 import org.schabi.newpipe.error.UserAction;
 import org.schabi.newpipe.extractor.Image;
 import org.schabi.newpipe.extractor.NewPipe;
-import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
 import org.schabi.newpipe.extractor.exceptions.ContentNotSupportedException;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.stream.AudioStream;
@@ -1011,19 +1010,6 @@ public void scrollToTop() {
         updateTabLayoutVisibility();
     }
 
-    public void scrollToComment(final CommentsInfoItem comment) {
-        final int commentsTabPos = pageAdapter.getItemPositionByTitle(COMMENTS_TAB_TAG);
-        final var fragment = pageAdapter.getItem(commentsTabPos);
-
-        // TODO: Implement the scrolling with Compose.
-        // unexpand the app bar only if scrolling to the comment succeeded
-//        if (fragment instanceof CommentsFragment commentsFragment &&
-//                commentsFragment.scrollToComment(comment)) {
-//            binding.appBarLayout.setExpanded(false, false);
-//            binding.viewPager.setCurrentItem(commentsTabPos, false);
-//        }
-    }
-
     /*//////////////////////////////////////////////////////////////////////////
     // Play Utils
     //////////////////////////////////////////////////////////////////////////*/

app/src/main/java/org/schabi/newpipe/ui/components/video/comment/CommentSection.kt

@@ -27,6 +27,7 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flowOf
 import my.nanihadesuka.compose.LazyColumnScrollbar
 import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.Page
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem
 import org.schabi.newpipe.extractor.stream.Description
 import org.schabi.newpipe.paging.CommentsDisabledException
@@ -91,7 +92,17 @@ private class CommentDataProvider : PreviewParameterProvider<PagingData<Comments
     override val values = sequenceOf(
         // Normal view
         PagingData.from(
-            (1..100).map {
+            listOf(
+                CommentsInfoItem(
+                    commentText = Description(
+                        "Comment 1\n\nThis line should be hidden by default.",
+                        Description.PLAIN_TEXT
+                    ),
+                    uploaderName = "Test",
+                    replies = Page(""),
+                    replyCount = 10
+                )
+            ) + (2..10).map {
                 CommentsInfoItem(
                     commentText = Description("Comment $it", Description.PLAIN_TEXT),
                     uploaderName = "Test"