Initial support for member suggestions (#1631)

* Initial support for member suggestion (search and UI)

* Add custom `BottomSheetScaffold` implementation to workaround several scrolling bugs

* Start searching as soon as `@` is typed, add UI following initial designs

* Extract suggestion processing code

* Extract component, add previews, fix tests

* Add tests

* Add exception from kover to the forked bottom sheet code

* Add a feature flag for mentions

- Extract composer & mention suggestions to their composable.
- Extract mentions suggestions processing to its own class.
- Add `MatrixRoom.canTriggerRoomNotification` function.
- Update strings and conditions for displaying the `@room` mention.

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoom.kt

@@ -130,6 +130,8 @@ interface MatrixRoom : Closeable {
 
     suspend fun canUserSendMessage(userId: UserId, type: MessageEventType): Result<Boolean>
 
+    suspend fun canUserTriggerRoomNotification(userId: UserId): Result<Boolean>
+
     suspend fun updateAvatar(mimeType: String, data: ByteArray): Result<Unit>
 
     suspend fun removeAvatar(): Result<Unit>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/user/CurrentSessionIdHolder.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.matrix.api.user
+
+import io.element.android.libraries.di.SessionScope
+import io.element.android.libraries.di.SingleIn
+import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.core.SessionId
+import javax.inject.Inject
+
+@SingleIn(SessionScope::class)
+class CurrentSessionIdHolder @Inject constructor(matrixClient: MatrixClient) {
+    val current = matrixClient.sessionId
+
+    fun isCurrentSession(sessionId: SessionId?): Boolean = current == sessionId
+}

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RustMatrixRoom.kt

@@ -349,6 +349,12 @@ class RustMatrixRoom(
         }
     }
 
+    override suspend fun canUserTriggerRoomNotification(userId: UserId): Result<Boolean> {
+        return runCatching {
+            innerRoom.canUserTriggerRoomNotification(userId.value)
+        }
+    }
+
     override suspend fun sendImage(file: File, thumbnailFile: File, imageInfo: ImageInfo, progressCallback: ProgressCallback?): Result<MediaUploadHandler> {
         return sendAttachment(listOf(file, thumbnailFile)) {
             innerRoom.sendImage(file.path, thumbnailFile.path, imageInfo.map(), progressCallback?.toProgressWatcher())

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt

@@ -71,6 +71,7 @@ class FakeMatrixRoom(
     override val alternativeAliases: List<String> = emptyList(),
     override val isPublic: Boolean = true,
     override val isDirect: Boolean = false,
+    override val isOneToOne: Boolean = false,
     override val joinedMemberCount: Long = 123L,
     override val activeMemberCount: Long = 234L,
     val notificationSettingsService: NotificationSettingsService = FakeNotificationSettingsService(),
@@ -106,6 +107,7 @@ class FakeMatrixRoom(
     private var progressCallbackValues = emptyList<Pair<Long, Long>>()
     private var generateWidgetWebViewUrlResult = Result.success("https://call.element.io")
     private var getWidgetDriverResult: Result<MatrixWidgetDriver> = Result.success(FakeWidgetDriver())
+    private var canUserTriggerRoomNotificationResult: Result<Boolean> = Result.success(true)
     val editMessageCalls = mutableListOf<Pair<String, String?>>()
 
     var sendMediaCount = 0
@@ -270,6 +272,10 @@ class FakeMatrixRoom(
         return canSendEventResults[type] ?: Result.failure(IllegalStateException("No fake answer"))
     }
 
+    override suspend fun canUserTriggerRoomNotification(userId: UserId): Result<Boolean> {
+        return canUserTriggerRoomNotificationResult
+    }
+
     override suspend fun sendImage(
         file: File,
         thumbnailFile: File,
@@ -434,6 +440,10 @@ class FakeMatrixRoom(
         canSendEventResults[type] = result
     }
 
+    fun givenCanTriggerRoomNotification(result: Result<Boolean>) {
+        canUserTriggerRoomNotificationResult = result
+    }
+
     fun givenIgnoreResult(result: Result<Unit>) {
         ignoreResult = result
     }