Fixed managing and collapsing default category

app/src/main/java/eu/kanade/tachiyomi/ui/category/ManageCategoryDialog.kt

@@ -54,6 +54,7 @@ class ManageCategoryDialog(bundle: Bundle? = null) :
 
     private fun onPositiveButtonClick() {
         val view = dialogView ?: return
+        if (category.id ?: 0 <= 0) return
         val text = view.title.text.toString()
         val categoryExists = categoryExists(text)
         if (text.isNotBlank() && !categoryExists && !text.equals(category.name, true)) {
@@ -85,6 +86,12 @@ class ManageCategoryDialog(bundle: Bundle? = null) :
     }
 
     fun onViewCreated(view: View) {
+        if (category.id ?: 0 <= 0) {
+            view.title.gone()
+            view.download_new.gone()
+            view.include_global.gone()
+            return
+        }
         view.edit_categories.setOnClickListener {
             router.popCurrentController()
             router.pushController(CategoryController().withFadeTransaction())

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

@@ -424,6 +424,7 @@ class LibraryPresenter(
             it.toIntOrNull()
         }.toMutableSet()
 
+        if (categorySet.contains(0)) categories.add(0, createDefaultCategory())
         if (showCategories) {
             categories.forEach { category ->
                 val catId = category.id ?: return@forEach
@@ -435,7 +436,7 @@ class LibraryPresenter(
                 } else if (catId in categoriesHidden) {
                     val mangaToRemove = items.filter { it.manga.category == catId }
                     val mergedTitle = mangaToRemove.joinToString("-") {
-                        it.manga.title
+                        it.manga.title + "-" + it.manga.author
                     }
                     items.removeAll(mangaToRemove)
                     val headerItem = headerItems[catId]
@@ -446,8 +447,6 @@ class LibraryPresenter(
             }
         }
 
-        if (categorySet.contains(0)) categories.add(0, createDefaultCategory())
-
         categories.forEach {
             it.isHidden = it.id in categoriesHidden
         }