Move the editor handling back to Vst2Bridge

Since we can have multiple editors in Vst3Bridge.

src/wine-host/bridges/vst2.h

@@ -29,6 +29,7 @@
 
 #include "../../common/communication/vst2.h"
 #include "../../common/configuration.h"
+#include "../editor.h"
 #include "../utils.h"
 #include "common.h"
 
@@ -66,6 +67,9 @@ class Vst2Bridge : public HostBridge {
      */
     void run() override;
 
+    void handle_x11_events() override;
+    void handle_win32_events() override;
+
     /**
      * Forward the host callback made by the plugin to the host and return the
      * results.
@@ -144,6 +148,13 @@ class Vst2Bridge : public HostBridge {
      */
     Vst2Sockets<Win32Thread> sockets;
 
+    /**
+     * The plugin editor window. Allows embedding the plugin's editor into a
+     * Wine window, and embedding that Wine window into a window provided by the
+     * host. Should be empty when the editor is not open.
+     */
+    std::optional<Editor> editor;
+
     /**
      * The MIDI events that have been received **and processed** since the last
      * call to `processReplacing()`. 99% of plugins make a copy of the MIDI