try to address resizing issues

apps/weblibre/android/app/src/main/AndroidManifest.xml

@@ -94,6 +94,7 @@
             android:taskAffinity="${applicationId}.task"
             android:theme="@style/LaunchTheme"
             android:supportsPictureInPicture="true"
+            android:resizeableActivity="true"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">
@@ -271,9 +272,14 @@
             android:name="io.flutter.embedding.android.EnableImpeller"
             android:value="false" />
 
+        <!-- HCPP (Hybrid Composition++) is still experimental and mis-maps
+             platform-view touch coordinates when the activity runs in a resized
+             window (split-screen, freeform/pop-up). GeckoView then receives
+             touches offset from where content is drawn (see issue #450). Fall
+             back to standard hybrid composition until HCPP handles multi-window. -->
         <meta-data
             android:name="io.flutter.embedding.android.EnableHcpp"
-            android:value="true" />
+            android:value="false" />
 
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->