From f0a3c9c2dc761a45a790db45794ce82554c0fe83 Mon Sep 17 00:00:00 2001
From: inorichi <chibilen@gmail.com>
Date: Mon, 18 Jan 2016 19:41:11 +0100
Subject: [PATCH] Don't reset library adapter if it's not needed

---
 .../eu/kanade/tachiyomi/ui/library/LibraryAdapter.java |  6 ++++--
 .../tachiyomi/ui/library/LibraryCategoryFragment.java  | 10 +++++++---
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryAdapter.java b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryAdapter.java
index c25964d6b7..bb9b3e858b 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryAdapter.java
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryAdapter.java
@@ -32,8 +32,10 @@ public class LibraryAdapter extends SmartFragmentStatePagerAdapter {
     }
 
     public void setCategories(List<Category> categories) {
-        this.categories = categories;
-        notifyDataSetChanged();
+        if (this.categories != categories) {
+            this.categories = categories;
+            notifyDataSetChanged();
+        }
     }
 
     public void setSelectionMode(int mode) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryFragment.java b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryFragment.java
index 37d69409a5..eef465aca9 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryFragment.java
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryFragment.java
@@ -34,6 +34,7 @@ public class LibraryCategoryFragment extends BaseFragment
 
     @State int position;
     private LibraryCategoryAdapter adapter;
+    private List<Manga> mangas;
 
     private Subscription numColumnsSubscription;
 
@@ -112,10 +113,13 @@ public class LibraryCategoryFragment extends BaseFragment
 
         Category category = categories.get(position);
         List<Manga> mangas = event.getMangasForCategory(category);
-        if (mangas == null) {
-            mangas = new ArrayList<>();
+        if (this.mangas != mangas) {
+            this.mangas = mangas;
+            if (mangas == null) {
+                mangas = new ArrayList<>();
+            }
+            setMangas(mangas);
         }
-        setMangas(mangas);
     }
 
     protected void openManga(Manga manga) {