Show empty screen when a category is empty (#8690)

* Show empty screen when a category is empty

* Review changes

* Review changes #2

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

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryScreenModel.kt

@@ -742,17 +742,19 @@ class LibraryScreenModel(
         val showMangaContinueButton: Boolean = false,
         val dialog: Dialog? = null,
     ) {
-        val selectionMode = selection.isNotEmpty()
-
-        val categories = library.keys.toList()
-
-        val libraryCount by lazy {
+        private val libraryCount by lazy {
             library.values
                 .flatten()
                 .fastDistinctBy { it.libraryManga.manga.id }
                 .size
         }
 
+        val isLibraryEmpty by lazy { libraryCount == 0 }
+
+        val selectionMode = selection.isNotEmpty()
+
+        val categories = library.keys.toList()
+
         fun getLibraryItemsByCategoryId(categoryId: Long): List<LibraryItem>? {
             return library.firstNotNullOfOrNull { (k, v) -> v.takeIf { k.id == categoryId } }
         }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryTab.kt

@@ -149,7 +149,7 @@ object LibraryTab : Tab {
         ) { contentPadding ->
             when {
                 state.isLoading -> LoadingScreen(modifier = Modifier.padding(contentPadding))
-                state.searchQuery.isNullOrEmpty() && !state.hasActiveFilters && state.libraryCount == 0 -> {
+                state.searchQuery.isNullOrEmpty() && !state.hasActiveFilters && state.isLibraryEmpty -> {
                     val handler = LocalUriHandler.current
                     EmptyScreen(
                         textResource = R.string.information_empty_library,
@@ -170,6 +170,7 @@ object LibraryTab : Tab {
                         selection = state.selection,
                         contentPadding = contentPadding,
                         currentPage = { screenModel.activeCategoryIndex },
+                        hasActiveFilters = state.hasActiveFilters,
                         showPageTabs = state.showCategoryTabs || !state.searchQuery.isNullOrEmpty(),
                         onChangeCurrentPage = { screenModel.activeCategoryIndex = it },
                         onMangaClicked = { navigator.push(MangaScreen(it)) },