Mention Melda GPU accelerated rendering issues

There are no issues with software rendering.

README.md

@@ -262,6 +262,11 @@ include:
   Center.
 - **Serum** requires you to disable `d2d1.dll` in `winecfg` and to install
   `gdiplus` through `winetricks`.
+- **MeldaProduction** plugins have minor rendering issues when GPU acceleration
+  is enabled. This can be fixed by disabling GPU acceleration in the plugin
+  settings. I'm not sure whether this is an issue with Wine or the plugins
+  themselves. Notable issues here are missing redraws and incorrect positioning
+  when the window gets dragged offscreen on the top and left dies of the screen.
 - Plugins like **FabFilter Pro-Q 3** that can share data between different
   instances of the same plugin plugins have to be hosted within a single process
   for that functionality to work. See the [plugin groups](#Plugin-groups)

src/wine-host/editor.cpp

@@ -220,12 +220,6 @@ void Editor::fix_local_coordinates() const {
 
     // We can't directly use the `event.x` and `event.y` coordinates because the
     // parent window may also be embedded inside another window.
-    // XXX: There's a quirk with either the Melda plugins or Wine itself that
-    //      cause rendering issues with those plugins and negative screen
-    //      coordinates, i.e. when the window gets dragged offscreen at the top
-    //      and left sides of the screen. These plugins sometimes also do not
-    //      redraw properly. I have not found any other plugins that behave like
-    //      this, so I'll it's not something we can fix ourselves.
     const auto translate_cookie = xcb_translate_coordinates(
         x11_connection.get(), parent_window, root, 0, 0);
     const xcb_translate_coordinates_reply_t* translated_coordinates =