make sure not to send twice the same key for subsequent pages

app/src/main/java/org/pixeldroid/app/posts/feeds/uncachedFeeds/accountLists/FollowersPagingSource.kt

@@ -56,7 +56,7 @@ class FollowersPagingSource(
             LoadResult.Page(
                 data = accounts,
                 prevKey = null,
-                nextKey = if (accounts.isEmpty() or nextPosition.isEmpty()) null else nextPosition
+                nextKey = if (accounts.isEmpty() || nextPosition.isEmpty() || nextPosition == position) null else nextPosition
             )
         } catch (exception: IOException) {
             LoadResult.Error(exception)

app/src/main/java/org/pixeldroid/app/posts/feeds/uncachedFeeds/hashtags/HashTagPagingSource.kt

@@ -25,10 +25,12 @@ class HashTagPagingSource(
                 max_id = position,
             )
 
+            val nextKey = response.lastOrNull()?.id
+
             LoadResult.Page(
                 data = response,
                 prevKey = null,
-                nextKey = response.lastOrNull()?.id
+                nextKey = if(nextKey == position) null else nextKey
             )
         } catch (exception: HttpException) {
             LoadResult.Error(exception)

app/src/main/java/org/pixeldroid/app/posts/feeds/uncachedFeeds/profile/ProfilePagingSource.kt

@@ -20,10 +20,12 @@ class ProfilePagingSource(
                 limit = params.loadSize
             )
 
+            val nextKey = posts.lastOrNull()?.id
+
             LoadResult.Page(
                 data = posts,
                 prevKey = null,
-                nextKey = posts.lastOrNull()?.id
+                nextKey = if(nextKey == position) null else nextKey
             )
         } catch (exception: HttpException) {
             LoadResult.Error(exception)

app/src/main/java/org/pixeldroid/app/posts/feeds/uncachedFeeds/search/SearchPagingSource.kt

@@ -34,10 +34,12 @@ class SearchPagingSource<T: FeedContent>(
                 Results.SearchType.statuses -> response.statuses
             } as List<T>
 
+            val nextKey = if (repos.isEmpty()) null else (position ?: 0) + repos.size
+
             LoadResult.Page(
                 data = repos,
                 prevKey = null,
-                nextKey = if (repos.isEmpty()) null else (position ?: 0) + repos.size
+                nextKey = if(nextKey == position) null else nextKey
             )
         } catch (exception: HttpException) {
             LoadResult.Error(exception)