Don't update page progress and allow preload when on StencilPage (#7899)

Also cleanup a little in WebtoonPageHolder

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt

@@ -39,6 +39,7 @@ import eu.kanade.tachiyomi.ui.reader.loader.HttpPageLoader
 import eu.kanade.tachiyomi.ui.reader.model.InsertPage
 import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
+import eu.kanade.tachiyomi.ui.reader.model.StencilPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 import eu.kanade.tachiyomi.ui.reader.setting.OrientationType
 import eu.kanade.tachiyomi.ui.reader.setting.ReadingModeType
@@ -414,8 +415,8 @@ class ReaderPresenter(
 
         val selectedChapter = page.chapter
 
-        // Insert page doesn't change page progress
-        if (page is InsertPage) {
+        // InsertPage and StencilPage doesn't change page progress
+        if (page is InsertPage || page is StencilPage) {
             return
         }
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonPageHolder.kt

@@ -246,19 +246,19 @@ class WebtoonPageHolder(
         unsubscribeReadImageHeader()
         val streamFn = page?.stream ?: return
 
-        var openStream: InputStream? = null
         readImageHeaderSubscription = Observable
             .fromCallable {
                 val stream = streamFn().buffered(16)
-                openStream = process(stream)
-
-                ImageUtil.isAnimatedAndSupported(stream)
+                val imageStream = process(stream)
+                val isAnimated = ImageUtil.isAnimatedAndSupported(stream)
+                Pair(imageStream, isAnimated)
             }
             .subscribeOn(Schedulers.io())
             .observeOn(AndroidSchedulers.mainThread())
-            .doOnNext { isAnimated ->
+            .doOnNext { (imageStream, isAnimated) ->
+                imageStream.use {
                     frame.setImage(
-                    openStream!!,
+                        it,
                         isAnimated,
                         ReaderPageImageView.Config(
                             zoomDuration = viewer.config.doubleTapAnimDuration,
@@ -267,9 +267,7 @@ class WebtoonPageHolder(
                         ),
                     )
                 }
-            // Keep the Rx stream alive to close the input stream only when unsubscribed
-            .flatMap { Observable.never<Unit>() }
-            .doOnUnsubscribe { openStream?.close() }
+            }
             .subscribe({}, {})
 
         addSubscription(readImageHeaderSubscription)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonViewer.kt

@@ -210,6 +210,11 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
         logcat { "onPageSelected: ${page.number}/${pages.size}" }
         activity.onPageSelected(page)
 
+        // Skip preload on StencilPage
+        if (page is StencilPage) {
+            return
+        }
+
         // Preload next chapter once we're within the last 5 pages of the current chapter
         val inPreloadRange = pages.size - page.number < 5
         if (inPreloadRange && allowPreload && page.chapter == adapter.currentChapter) {