gl_rasterizer_cache: unlink watchers if surface is moved to remove_surfaces but is not immediately removed

src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

@@ -1300,6 +1300,7 @@ SurfaceRect_Tuple RasterizerCacheOpenGL::GetSurfaceSubRect(const SurfaceParams&
 
             // Delete the expanded surface, this can't be done safely yet
             // because it may still be in use
+            surface->UnlinkAllWatcher(); // unlink watchers as if this surface is already deleted
             remove_surfaces.emplace(surface);
 
             surface = new_surface;

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -397,6 +397,16 @@ struct CachedSurface : SurfaceParams, std::enable_shared_from_this<CachedSurface
         }
     }
 
+    void UnlinkAllWatcher() {
+        for (const auto& watcher : watchers) {
+            if (auto locked = watcher.lock()) {
+                locked->valid = false;
+                locked->surface.reset();
+            }
+        }
+        watchers.clear();
+    }
+
 private:
     std::list<std::weak_ptr<SurfaceWatcher>> watchers;
 };