Also resize the wrapper window for VST3 plugins

src/wine-host/bridges/vst3.h

@@ -292,6 +292,14 @@ class Vst3Bridge : public HostBridge {
 
     void handle_x11_events() noexcept override;
 
+    /**
+     * If the plugin instance has an editor, resize the wrapper window to match
+     * the new size. This is called from `IPlugFrame::resizeView()` to make sure
+     * we do the resize before the request gets sent to the host.
+     */
+    bool maybe_resize_editor(size_t instance_id,
+                             const Steinberg::ViewRect& new_size);
+
     /**
      * Register a context with with `context_menu`'s ID and owner in
      * `object_instances`. This will be called during the constructor of