Fix crash on theme switching, reworded settings for catalouges

app/src/main/java/eu/kanade/tachiyomi/util/view/ViewExtensions.kt

@@ -339,6 +339,7 @@ fun Controller.scrollViewWith(recycler: RecyclerView,
             super.onScrolled(recyclerView, dx, dy)
             if (router?.backstack?.lastOrNull()?.controller() == this@scrollViewWith &&
                 statusBarHeight > -1 &&
+                activity != null &&
                 activity!!.appbar.height > 0) {
                 activity!!.appbar.y -= dy
                 activity!!.appbar.y = clamp(
@@ -353,7 +354,7 @@ fun Controller.scrollViewWith(recycler: RecyclerView,
             super.onScrollStateChanged(recyclerView, newState)
             if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                 if (router?.backstack?.lastOrNull()?.controller() == this@scrollViewWith &&
-                    statusBarHeight > -1 &&
+                    statusBarHeight > -1 && activity != null &&
                     activity!!.appbar.height > 0) {
                     val halfWay = abs((-activity!!.appbar.height.toFloat()) / 2)
                     val shortAnimationDuration = resources?.getInteger(

app/src/main/res/menu/catalogue_main.xml

@@ -11,7 +11,7 @@
         app:actionViewClass="androidx.appcompat.widget.SearchView"/>
 
     <item android:id="@+id/action_filter"
-        android:title="@string/action_filter"
+        android:title="@string/action_view_all_sources"
         android:icon="@drawable/ic_filter_list_white_24dp"
         app:showAsAction="never"/>
 

app/src/main/res/values/strings.xml

@@ -42,6 +42,7 @@
 
     <!-- Actions -->
     <string name="action_filter">Filter</string>
+    <string name="action_view_all_sources">View all sources</string>
     <string name="action_view_options">View options</string>
     <string name="action_filter_downloaded">Downloaded</string>
     <string name="action_filter_not_downloaded">Not downloaded</string>