Ensure that we can "not filter" the rooms.

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/roomlist/RoomListFilter.kt

@@ -20,6 +20,7 @@ sealed interface RoomListFilter {
     companion object {
         /**
          * Create a filter that matches all the given filters.
+         * If not filters are provided, all the room will match.
          */
         fun all(vararg filters: RoomListFilter): RoomListFilter {
             return All(filters.toList())
@@ -35,6 +36,7 @@ sealed interface RoomListFilter {
 
     /**
      * A filter that matches all the given filters.
+     * If [filters] is empty, all the room will match.
      */
     data class All(
         val filters: List<RoomListFilter>

libraries/matrix/impl/src/test/kotlin/io/element/android/libraries/matrix/impl/roomlist/RoomListFilterTest.kt

@@ -136,4 +136,10 @@ class RoomListFilterTest {
         )
         assertThat(roomSummaries.filter(filter)).isEmpty()
     }
+
+    @Test
+    fun `Room list filter all with empty list`() = runTest {
+        val filter = RoomListFilter.all()
+        assertThat(roomSummaries.filter(filter)).isEqualTo(roomSummaries)
+    }
 }