RoomListDeclineInviteMenu: limit room name

Improve preview.
Closes #6659

appconfig/src/main/kotlin/io/element/android/appconfig/ProtectionConfig.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2026 Element Creations 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.appconfig
+
+object ProtectionConfig {
+    /**
+     * The maximum length of a room name, to limit attack vectors in room invite.
+     */
+    const val MAX_ROOM_NAME_LENGTH = 128
+}

features/home/impl/src/main/kotlin/io/element/android/features/home/impl/roomlist/RoomListDeclineInviteMenu.kt

@@ -19,10 +19,13 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
+import io.element.android.appconfig.ProtectionConfig
 import io.element.android.compound.theme.ElementTheme
 import io.element.android.features.home.impl.R
 import io.element.android.features.home.impl.model.RoomListRoomSummary
+import io.element.android.libraries.core.extensions.toSafeLength
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.Button
@@ -44,7 +47,11 @@ fun RoomListDeclineInviteMenu(
         onDismissRequest = { eventSink(RoomListEvent.HideDeclineInviteMenu) },
     ) {
         RoomListDeclineInviteMenuContent(
-            roomName = menu.roomSummary.name ?: menu.roomSummary.roomId.value,
+            roomName = menu.roomSummary.name?.toSafeLength(
+                maxLength = ProtectionConfig.MAX_ROOM_NAME_LENGTH,
+                ellipsize = true,
+            )
+                ?: menu.roomSummary.roomId.value,
             onDeclineClick = {
                 eventSink(RoomListEvent.HideDeclineInviteMenu)
                 eventSink(RoomListEvent.DeclineInvite(menu.roomSummary, false))
@@ -112,16 +119,15 @@ private fun RoomListDeclineInviteMenuContent(
     }
 }
 
-// TODO This component should be seen in [RoomListView] @Preview but it doesn't show up.
-// see: https://issuetracker.google.com/issues/283843380
-// Remove this preview when the issue is fixed.
 @PreviewsDayNight
 @Composable
-internal fun RoomListDeclineInviteMenuContentPreview() = ElementPreview {
+internal fun RoomListDeclineInviteMenuContentPreview(
-    RoomListDeclineInviteMenuContent(
+    @PreviewParameter(RoomListStateDeclineInviteMenuShownProvider::class) menu: RoomListState.DeclineInviteMenu.Shown,
-        roomName = "Room name",
+) = ElementPreview {
-        onCancelClick = {},
+    RoomListDeclineInviteMenu(
-        onDeclineClick = {},
+        menu = menu,
+        canReportRoom = false,
         onDeclineAndBlockClick = {},
+        eventSink = {},
     )
 }

features/home/impl/src/main/kotlin/io/element/android/features/home/impl/roomlist/RoomListStateDeclineInviteMenuShownProvider.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2026 Element Creations 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.features.home.impl.roomlist
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import androidx.compose.ui.tooling.preview.datasource.LoremIpsum
+import io.element.android.features.home.impl.model.RoomListRoomSummary
+import io.element.android.features.home.impl.model.aRoomListRoomSummary
+
+open class RoomListStateDeclineInviteMenuShownProvider : PreviewParameterProvider<RoomListState.DeclineInviteMenu.Shown> {
+    override val values: Sequence<RoomListState.DeclineInviteMenu.Shown>
+        get() = sequenceOf(
+            aDeclineInviteMenuShown(),
+            aDeclineInviteMenuShown(
+                aRoomListRoomSummary(
+                    name = LoremIpsum(500).values.first(),
+                )
+            ),
+            aDeclineInviteMenuShown(
+                aRoomListRoomSummary(
+                    name = null,
+                )
+            ),
+        )
+}
+
+internal fun aDeclineInviteMenuShown(
+    roomSummary: RoomListRoomSummary = aRoomListRoomSummary(),
+) = RoomListState.DeclineInviteMenu.Shown(
+    roomSummary = roomSummary,
+)