Fix update of windowsizeclass.

app/src/main/AndroidManifest.xml

@@ -1045,7 +1045,7 @@
     <activity android:name=".MainActivity"
               android:enableOnBackInvokedCallback="true"
               android:theme="@style/Theme.Signal.DayNight.NoActionBar"
-              android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout"
+              android:configChanges="touchscreen|keyboard|keyboardHidden"
               android:windowSoftInputMode="stateUnchanged"
               android:resizeableActivity="true"
               android:exported="false"/>

app/src/main/java/org/thoughtcrime/securesms/MainActivity.kt

@@ -430,6 +430,10 @@ class MainActivity : PassphraseRequiredActivity(), VoiceNoteMediaControllerOwner
           }
         }
 
+        LaunchedEffect(windowSizeClass) {
+          paneExpansionState.animateTo(detailAndListAnchor)
+        }
+
         LaunchedEffect(paneExpansionState.currentAnchor, detailOnlyAnchor, listOnlyAnchor, detailAndListAnchor) {
           val isFullScreenPane = when (paneExpansionState.currentAnchor) {
             listOnlyAnchor, detailOnlyAnchor -> {

app/src/main/java/org/thoughtcrime/securesms/window/AppScaffold.kt

@@ -187,10 +187,16 @@ enum class WindowSizeClass(
         }
 
         Configuration.ORIENTATION_LANDSCAPE -> {
-          when (windowSizeClass.windowHeightSizeClass) {
-            WindowHeightSizeClass.COMPACT -> COMPACT_LANDSCAPE
-            WindowHeightSizeClass.MEDIUM -> MEDIUM_LANDSCAPE
-            WindowHeightSizeClass.EXPANDED -> EXTENDED_LANDSCAPE
+          when (windowSizeClass.windowWidthSizeClass) {
+            WindowWidthSizeClass.COMPACT -> COMPACT_LANDSCAPE
+            WindowWidthSizeClass.MEDIUM -> {
+              if (windowSizeClass.windowHeightSizeClass == WindowHeightSizeClass.COMPACT) {
+                COMPACT_LANDSCAPE
+              } else {
+                MEDIUM_LANDSCAPE
+              }
+            }
+            WindowWidthSizeClass.EXPANDED -> EXTENDED_LANDSCAPE
             else -> error("Unsupported.")
           }
         }