Invite users to existing rooms (#441)

Invite users to existing rooms

Scope:

- Allow inviting from the room detail screen and the member list
- Invite option is only shown if the user has the correct power level
- Search flow the same as creating a new room, allowing multi-select
- Existing room members/invitees are disabled with a custom caption
- Sending is asynchronous, an error dialog will appear wherever the
  user is if necessary

Closes #245

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

@@ -40,6 +40,7 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onStart
 import kotlinx.coroutines.withContext
 import org.matrix.rustcomponents.sdk.Room
+import org.matrix.rustcomponents.sdk.RoomMember
 import org.matrix.rustcomponents.sdk.SlidingSyncRoom
 import org.matrix.rustcomponents.sdk.UpdateSummary
 import org.matrix.rustcomponents.sdk.genTransactionId
@@ -209,6 +210,18 @@ class RustMatrixRoom(
         }
     }
 
+    override suspend fun inviteUserById(id: UserId): Result<Unit> = withContext(coroutineDispatchers.io) {
+        runCatching {
+            innerRoom.inviteUserById(id.value)
+        }
+    }
+
+    override suspend fun canInvite(): Result<Boolean> = withContext(coroutineDispatchers.io) {
+        runCatching {
+            innerRoom.member(sessionId.value).use(RoomMember::canInvite)
+        }
+    }
+
     override suspend fun sendImage(file: File, thumbnailFile: File, imageInfo: ImageInfo): Result<Unit> {
         return runCatching {
             innerRoom.sendImage(file.path, thumbnailFile.path, imageInfo.map())

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/timeline/RustMatrixTimeline.kt

@@ -152,6 +152,7 @@ class RustMatrixTimeline(
                     RequiredState(key = "m.room.canonical_alias", value = ""),
                     RequiredState(key = "m.room.topic", value = ""),
                     RequiredState(key = "m.room.join_rules", value = ""),
+                    RequiredState(key = "m.room.power_levels", value = ""),
                 ),
                 timelineLimit = null
             )