Add "Play" button on manga in library (#8218)

* resume manga button in libarary

* work on resume button

* Backup

* work on opening the last read chapter

* backup

* renaming

* fab instead of image

* done with logic

* cleanup

* cleanup

* import cleanup

* cleanup...

* refactoring

* fixing logic

* fixing scopes

* Reworking design

* adding ability to turn on/off the feature

* cleanup

* refactoring, fixing logic, adding filter logic (partial)

* backup

* backup

* logic done

* backup before merge fix

* merge conflict....

* merge conflict...

* reworking ui logic

* removing unnecessary file

* refactoring

* refactoring

* review changes + minor parameter position movement

* commiting suggestion

Co-authored-by: arkon <arkon@users.noreply.github.com>

* fixing minor mistake

* moving ChapterFilter.kt

Co-authored-by: arkon <arkon@users.noreply.github.com>

app/src/main/java/eu/kanade/tachiyomi/util/chapter/ChapterGetNextUnread.kt

@@ -0,0 +1,33 @@
+package eu.kanade.tachiyomi.util.chapter
+
+import eu.kanade.domain.chapter.model.Chapter
+import eu.kanade.domain.chapter.model.applyFilters
+import eu.kanade.domain.manga.model.Manga
+import eu.kanade.tachiyomi.data.download.DownloadManager
+import eu.kanade.tachiyomi.ui.manga.ChapterItem
+
+/**
+ * Gets next unread chapter with filters and sorting applied
+ */
+fun List<Chapter>.getNextUnread(manga: Manga, downloadManager: DownloadManager): Chapter? {
+    return applyFilters(manga, downloadManager).let { chapters ->
+        if (manga.sortDescending()) {
+            chapters.findLast { !it.read }
+        } else {
+            chapters.find { !it.read }
+        }
+    }
+}
+
+/**
+ * Gets next unread chapter with filters and sorting applied
+ */
+fun List<ChapterItem>.getNextUnread(manga: Manga): Chapter? {
+    return applyFilters(manga).let { chapters ->
+        if (manga.sortDescending()) {
+            chapters.findLast { !it.chapter.read }
+        } else {
+            chapters.find { !it.chapter.read }
+        }
+    }?.chapter
+}