Re-introduce window resizing while draggin

src/wine-host/editor.h

@@ -57,6 +57,14 @@ class Editor {
 
     void close();
 
+    /**
+     * Resize the window to match the given size, if open.
+     *
+     * @return Whether the resizing was succesful. Will return false if the
+     *   editor isn't open.
+     */
+    bool resize(const int width, const int height);
+
     /**
      * Embed the (open) window into a parent window.
      *