Prevent landscape text editing from taking over the screen.

It used to be that we let Android do the default behavior of
full-screening the EditText when in landscape, but honestly I
don't know who prefers that. So I've turned it off.

Fixes #8769

res/layout/conversation_input_panel.xml

@@ -89,6 +89,7 @@
                         android:layout_height="wrap_content"
                         android:layout_gravity="center_vertical"
                         android:layout_weight="1"
+                        android:imeOptions="flagNoExtractUi"
                         android:nextFocusForward="@+id/send_button"
                         android:nextFocusRight="@+id/send_button"
                         tools:visibility="invisible"