Replace our firstIfSingle extension with singleOrNull from the Kotlin library.

features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/banner/KnockRequestsBannerPresenter.kt

@@ -18,7 +18,6 @@ import io.element.android.features.knockrequests.impl.data.KnockRequestPresentab
 import io.element.android.features.knockrequests.impl.data.KnockRequestsService
 import io.element.android.libraries.architecture.Presenter
 import io.element.android.libraries.core.coroutine.mapState
-import io.element.android.libraries.core.extensions.firstIfSingle
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.delay
@@ -79,7 +78,7 @@ class KnockRequestsBannerPresenter @Inject constructor(
         knockRequests: List<KnockRequestPresentable>,
         displayAcceptError: MutableState<Boolean>,
     ) = launch {
-        val knockRequest = knockRequests.firstIfSingle()
+        val knockRequest = knockRequests.singleOrNull()
         if (knockRequest != null) {
             knockRequestsService.acceptKnockRequest(knockRequest, optimistic = true)
                 .onFailure {

features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/banner/KnockRequestsBannerState.kt

@@ -12,7 +12,6 @@ import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import io.element.android.features.knockrequests.impl.R
 import io.element.android.features.knockrequests.impl.data.KnockRequestPresentable
-import io.element.android.libraries.core.extensions.firstIfSingle
 import kotlinx.collections.immutable.ImmutableList
 
 data class KnockRequestsBannerState(
@@ -22,8 +21,8 @@ data class KnockRequestsBannerState(
     val canAccept: Boolean,
     val eventSink: (KnockRequestsBannerEvents) -> Unit,
 ) {
-    val subtitle = knockRequests.firstIfSingle()?.userId?.value
+    val subtitle = knockRequests.singleOrNull()?.userId?.value
-    val reason = knockRequests.firstIfSingle()?.reason
+    val reason = knockRequests.singleOrNull()?.reason
 
     @Composable
     fun formattedTitle(): String {

libraries/core/src/main/kotlin/io/element/android/libraries/core/extensions/List.kt

@@ -1,15 +0,0 @@
-/*
- * Copyright 2024 New Vector Ltd.
- *
- * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
- * Please see LICENSE files in the repository root for full details.
- */
-
-package io.element.android.libraries.core.extensions
-
-/**
- * Returns the first element if the list contains exactly one element, otherwise returns null.
- */
-inline fun <reified T> List<T>.firstIfSingle(): T? {
-    return if (size == 1) first() else null
-}