Fix room list not scrollable in room select screen when the account switch is hidden

The nested scroll connection of the account switch section was always attached. When the section is not displayed
(single account, Forward mode, or search active), its height offset limit is never set and stays at -Float.MAX_VALUE,
so the connection consumed all the scroll events and the room list could not be scrolled.

Only attach the connection when the account switch section is displayed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

libraries/roomselect/impl/src/main/kotlin/io/element/android/libraries/roomselect/impl/RoomSelectView.kt

@@ -177,7 +177,14 @@ fun RoomSelectView(
             Modifier
                 .padding(paddingValues)
                 .consumeWindowInsets(paddingValues)
-                .nestedScroll(accountSwitchScrollBehavior.nestedScrollConnection)
+                .then(
+                    // Only when the account switch section is displayed, else its unknown height would consume all the scroll events
+                    if (state.showAccountSwitch && !state.isSearchActive) {
+                        Modifier.nestedScroll(accountSwitchScrollBehavior.nestedScrollConnection)
+                    } else {
+                        Modifier
+                    }
+                )
         ) {
             SearchBar(
                 modifier = Modifier

libraries/roomselect/impl/src/test/kotlin/io/element/android/libraries/roomselect/impl/RoomSelectViewTest.kt

@@ -13,8 +13,12 @@ import androidx.activity.ComponentActivity
 import androidx.compose.ui.test.AndroidComposeUiTest
 import androidx.compose.ui.test.ExperimentalTestApi
 import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.assertIsNotDisplayed
 import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.onRoot
 import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.performTouchInput
+import androidx.compose.ui.test.swipeUp
 import androidx.compose.ui.test.v2.runAndroidComposeUiTest
 import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
 import io.element.android.libraries.matrix.api.core.RoomId
@@ -29,6 +33,7 @@ import io.element.android.tests.testutils.EventsRecorder
 import io.element.android.tests.testutils.clickOn
 import io.element.android.tests.testutils.robolectric.RobolectricTest
 import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
 import org.junit.Test
 import org.robolectric.annotation.Config
 
@@ -123,6 +128,33 @@ class RoomSelectViewTest : RobolectricTest() {
         onNodeWithText(activity!!.getString(CommonStrings.common_switch_account)).assertDoesNotExist()
     }
 
+    @Test
+    fun `the room list can be scrolled when there is no other account`() = runAndroidComposeUiTest {
+        setRoomSelectView(
+            aRoomSelectState(
+                mode = RoomSelectMode.Share,
+                resultState = SearchBarResultState.Results(aLongRoomList()),
+            ),
+        )
+        onNodeWithText("Room 0").assertIsDisplayed()
+        onRoot().performTouchInput { swipeUp() }
+        onNodeWithText("Room 0").assertIsNotDisplayed()
+    }
+
+    @Test
+    fun `the room list can be scrolled when there are other accounts`() = runAndroidComposeUiTest {
+        setRoomSelectView(
+            aRoomSelectState(
+                mode = RoomSelectMode.Share,
+                resultState = SearchBarResultState.Results(aLongRoomList()),
+                otherAccounts = persistentListOf(aMatrixUser(id = "@bob:example.org", displayName = "Bob")),
+            ),
+        )
+        onNodeWithText("Room 0").assertIsDisplayed()
+        onRoot().performTouchInput { swipeUp() }
+        onNodeWithText("Room 0").assertIsNotDisplayed()
+    }
+
     @Test
     fun `an error is displayed instead of the rooms if they cannot be loaded`() = runAndroidComposeUiTest<ComponentActivity> {
         setRoomSelectView(
@@ -150,3 +182,10 @@ private fun AndroidComposeUiTest<ComponentActivity>.setRoomSelectView(
         )
     }
 }
+
+private fun aLongRoomList() = List(30) { index ->
+    aSelectRoomInfo(
+        roomId = RoomId("!room$index:domain"),
+        name = "Room $index",
+    )
+}.toImmutableList()