From ff61a46e943c25570823f131a3f2f3aa28b93fac Mon Sep 17 00:00:00 2001
From: ganfra <francoisg@element.io>
Date: Thu, 24 Nov 2022 10:39:31 +0100
Subject: [PATCH] RoomList: extend a bit the range of SS window

---
 .../android/x/features/roomlist/RoomListViewModel.kt     | 9 ++++++++-
 .../java/io/element/android/x/matrix/MatrixClient.kt     | 2 +-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/features/roomlist/src/main/java/io/element/android/x/features/roomlist/RoomListViewModel.kt b/features/roomlist/src/main/java/io/element/android/x/features/roomlist/RoomListViewModel.kt
index e8d50887c4..aae69e5497 100644
--- a/features/roomlist/src/main/java/io/element/android/x/features/roomlist/RoomListViewModel.kt
+++ b/features/roomlist/src/main/java/io/element/android/x/features/roomlist/RoomListViewModel.kt
@@ -20,6 +20,8 @@ import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
 
+private const val extendedRangeSize = 40
+
 class RoomListViewModel(
     private val client: MatrixClient,
     initialState: RoomListViewState
@@ -69,7 +71,12 @@ class RoomListViewModel(
     fun updateVisibleRange(range: IntRange) {
         viewModelScope.launch {
             if (range.isEmpty()) return@launch
-            client.roomSummaryDataSource().setSlidingSyncRange(range)
+            val midExtendedRangeSize = extendedRangeSize / 2
+            val extendedRangeStart = (range.first - midExtendedRangeSize).coerceAtLeast(0)
+            // Safe to give bigger size than room list
+            val extendedRangeEnd = range.last + midExtendedRangeSize
+            val extendedRange = IntRange(extendedRangeStart, extendedRangeEnd)
+            client.roomSummaryDataSource().setSlidingSyncRange(extendedRange)
         }
     }
 
diff --git a/libraries/matrix/src/main/java/io/element/android/x/matrix/MatrixClient.kt b/libraries/matrix/src/main/java/io/element/android/x/matrix/MatrixClient.kt
index 24b7793721..2ac426a03d 100644
--- a/libraries/matrix/src/main/java/io/element/android/x/matrix/MatrixClient.kt
+++ b/libraries/matrix/src/main/java/io/element/android/x/matrix/MatrixClient.kt
@@ -49,7 +49,7 @@ class MatrixClient internal constructor(
         )
         .name(name = "HomeScreenView")
         .syncMode(mode = SlidingSyncMode.SELECTIVE)
-        .addRange(0u, 10u)
+        .addRange(0u, 30u)
         .build()
 
     private val slidingSync = client